The 2018 midterm elections, which featured hundreds of congressional, state and local primaries, culminated with the Nov. 6 general election. Democrats gained control of the House while Republicans kept power in the Senate.
Voters will decide the outcome of the special Senate race, which forced a runoff election when no candidate won a majority of the vote on Nov. 6.
A runoff election for federal offices is set for Jan. 8, 2019.
The Republican Debbie Lesko and the Democrat Hiral Tipirneni advanced to the general election on April 24. The seat, which Ms. Lesko went on to win, had been vacated when Representative Trent Franks resigned over sexual misconduct accusations.
Texas Democrats surged to the polls, demonstrating a wave of Trump-inspired energy, but also revealing internal divisions at the outset of a midterm campaign that looks otherwise promising to the party. Read more about the primaries.
Conor Lamb, a Democrat and former Marine, scored a razor-thin but extraordinary upset in a special House election in southwestern Pennsylvania, in the heart of President Trump’s Rust Belt base. The State Supreme Court recently issued a new map with redrawn boundaries, though, so Mr. Lamb ran in a different district in May.
Gov. Bruce Rauner, a Republican first-term incumbent, and J.B. Pritzker, a Democratic billionaire heir and businessman, emerged from the gubernatorial primaries, while the incumbent in a closely watched Democratic congressional primary overcame a progressive challenge. The governor’s race promises to be be fiercely fought and dominated by big money, with each candidate controlling tremendous sums of personal wealth.
Debbie Lesko, a Republican former state senator, fended off an unusually strong Democratic challenge to win a special election in the Eighth District, near Phoenix. Her victory demonstrated the resilience of the Republican base, but also showed how eager liberals are to compete even in reliably conservative districts. Read more.
Mr. Donnelly, who is believed to be one of the most vulnerable Democrats in the Senate, will face Mike Braun, a business executive who won the bruising Republican primary, in November.
Mark Harris, a Baptist minister who opposes same-sex marriage, defeated Representative Robert Pittenger in a Republican primary, making Mr. Pittenger the first incumbent from either party to lose a seat in Congress because of a primary challenger this year.
The race to succeed Gov. John Kasich will be a bruising national fight because the nominees — Attorney General Mike DeWine, a Republican, and Richard Cordray, a consumer advocate and Democrat — are ideological opposites.
Mr. Manchin, a Democrat in a red state that Mr. Trump won handily, will face Attorney General Patrick Morrisey, a Republican, in the general election. Mr. Morrisey defeated Don Blankenship, a former coal mining executive who spent a year in prison for his role in a fatal mining explosion, and Representative Evan Jenkins in the primary.
Lt. Gov. Brad Little won the Republican nomination to replace the three-term incumbent Butch Otter, who is retiring. Mr. Little is expected to easily win the general election in November.
Kara Eastman, a liberal Democrat, narrowly won the primary to challenge Representative Don Bacon, a Republican, in what is expected to be a competitive race in November. The Democratic primary focused heavily on abortion, with Ms. Eastman supporting abortion rights and her opponent, Brad Ashford, supporting more restrictions.
State Representative Knute Buehler defeated nine other Republicans in Oregon’s gubernatorial primary and will face Gov. Kate Brown, a Democrat, in November. The seat is considered safe for Democrats.
The first test of Pennsylvania’s redrawn congressional districts resulted in primary victories for several Democratic women. The new map is more favorable to Democrats than even the Democrats expected, and the party could well pick up four or more seats here in November.
Stacey Abrams, a Democratic former State House leader, became Georgia’s first black nominee for governor, a prize that has eluded earlier generations of African-American candidates in the state. Her candidacy will test just how much the state’s traditionally conservative politics are shifting. Read more here.
In the Democratic primary to challenge Representative Andy Barr, Amy McGrath, a former Marine fighter pilot running for office for the first time, upset national Democrats’ candidate of choice, Mayor Jim Gray of Lexington.
Gavin Newsom, the Democratic lieutenant governor, and John Cox, a Republican businessman, emerged from a crowded field in the governor’s race in California to advance to the general election, as did Ms. Feinstein, a Democrat, in the Senate race. In key House districts they hope to capture in November, Democrats avoided being shut out of the general election under the state’s “top two" primary system. Read more about the primary night in California.
Senator Thad Cochran’s decision to retire set off a game of musical chairs. Instead of Senator Roger Wicker having to defending his seat from a major rival in a Republican primary in June, the state’s big battle is expected in November, when there will be a special election to finish Mr. Cochran’s term. Chris McDaniel, a state senator who almost unseated Mr. Cochran in 2014 and had previously decided to challenge Mr. Wicker, will run in a growing field for Mr. Cochran’s seat instead. Mr. Wicker won his primary handily in this deeply red state.
Republicans nominated their state auditor, Matt Rosendale, a Maryland native, to challenge Senator Jon Tester, one of the nation’s most vulnerable Democrats.
A former Navy pilot, a veteran White House national security adviser and a conservative pro-gun state senator won Democratic nominations to represent battleground congressional districts in New Jersey, officially earning their spots on the front lines in a state that could determine control of the House. Read more in our analysis.
Representative Michelle Lujan Grisham, who prevailed in the Democratic primary for governor, will face Steve Pearce, a Republican congressman, in the general election. If Ms. Lujan Grisham were elected, she would be the first Latina Democratic governor in the United States, replacing Gov. Susana Martinez, a term-limited Republican who is also Latina. Read more here.
The Senate race is expected to be one of the most competitive in November, but the primaries were quiet. Representative Jacky Rosen, a Democrat, and Senator Dean Heller, a Republican, both easily won their respective nominations.
In one of the biggest upsets so far this year, Representative Mark Sanford, a Republican former governor once seen as a possible presidential candidate, lost to a conservative primary challenger, Katie Arrington. Read more.
Corey Stewart, a Republican who has defended the Confederacy and praised white nationalists, won his primary and will face Senator Tim Kaine, a Democrat, in November. Republican officials are worried that his primary victory may hurt down-ballot candidates.
In a major upset, Alexandria Ocasio-Cortez, a 28-year-old former Bernie Sanders campaign organizer, defeated longtime congressman and Democratic leader Joseph Crowley in the primary for a House district in the Bronx and Queens.
Four candidates from each party ran for Colorado’s open governorship, in a race that will test whether social and economic changes are turning Colorado more reliably blue. The state’s 1.2 million independent voters were able to participate in party primaries for the first time.
Chelsea Manning, a former Army private convicted of disclosing classified information, lost in the Democratic primary against Mr. Cardin.
Mick Cornett won the Republican gubernatorial primary and will aim to replace Gov. Mary Fallon, who has reached her term limit.
Mitt Romney, a former Republican presidential candidate and a critic of Mr. Trump, cruised to victory in the primary.
Gov. Henry McMaster, a Republican who has aligned himself closely with President Trump, defeated the businessman John Warren after being forced into a primary runoff.
A Republican, Michael Cloud, won the special election in Texas for the Congressional seat of Blake Farenthold, a Republican who resigned in April amid a sexual harassment scandal.
Representative Martha Roby won her Republican primary election that unfolded as a test of fealty to President Trump, defeating a challenger who assailed her for withdrawing her support for Mr. Trump in the last days of the 2016 campaign.
Brian Kemp, Georgia’s secretary of state, captured the Republican nomination for governor, easily dispatching the preferred candidate of the state party establishment after a series of provocative ads that evoked President Trump’s incendiary politics and a well-timed endorsement from the president himself.
Bill Lee, a wealthy businessman, won the Republican nomination for governor, beating five other candidates, including Representative Diane Black, who had aggressively tied herself to the Trump administration. Mr. Lee will face Karl Dean, a former Nashville mayor who easily won the Democratic primary, in the race to succeed Gov. Bill Haslam, a term-limited Republican.
Republicans succeeded in holding on to a traditionally safe congressional district when State Senator Troy Balderson eked out a narrow victory over a Democratic challenger, Danny O’Connor in a special election whose result was too close to call for nearly three weeks. Mr. Balderson will hold the seat for just over two months before he faces Mr. O’Connor again in the general election in November.
A week after voters went to the polls in Kansas, Gov. Jeff Colyer conceded in the race for the Republican nomination for governor, handing a razor-thin victory to Secretary of State Kris W. Kobach.
Gretchen Whitmer, a former leader in the Michigan State Senate, captured the Democratic nomination for governor and will face off against the state’s Republican attorney general, Bill Schuette, in a race that looms as a pivotal test of whether Democrats can reclaim power in a state President Trump won two years ago.
After a succession of political setbacks in onetime strongholds and a landmark defeat in the Supreme Court, organized labor notched a hard-won victory as Missouri voters overrode a legislative move to curb union power.
A crowded Democratic primary is likely to determine who takes the open House seat in the Honolulu-based First District.
Ms. Smith, a Democrat, took office in January as a temporary replacement after Mr. Franken resigned amid sexual misconduct accusations. Now, she is running for the final two years of the term; Republicans see an opening to pick off the seat.
Speaker Paul D. Ryan's mid-April announcement that he will not seek re-election for the First District signaled the peril that the Republican majority in the House faces.
Republican primary voters chose the establishment favorite, Representative Martha McSally, to replace Mr. Trump’s most outspoken G.O.P. critic in the Senate, Jeff Flake, in a contest that evolved into a test of which candidate could embrace Mr. Trump most snugly.
Florida Democrats nominated Andrew Gillum, the Tallahassee mayor, and Republicans tapped Representative Ron DeSantis for governor, setting the stage for a ferocious general election in the country’s largest swing state between one of President Trump’s most unabashed allies and an outspoken progressive who would be Florida’s first black governor.
Gov. Andrew M. Cuomo, a Democrat, is facing a primary challenge from the actress Cynthia Nixon.
In the Senate midterm elections, Democrats hope to win at least two new seats to regain control of the chamber, but their margin for error is slim. A majority of the seats up for election in 2018 are currently held by Democrats. Get a full preview here.
In the House midterm elections, Democrats need to flip 23 seats to capture the 218 seats necessary for control of the chamber. There are 194 likely or solidly Democratic seats and 166 likely or solidly Republican seats. The competitive races below are listed by state and district number. Get the latest updates here.
In addition to congressional elections, there are also 36 governor’s races on the ballot in 2018. With the next redistricting process set for after the 2020 election, winning gubernatorial and state legislative control will be crucial for both parties.
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