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Republican Party battleground primaries, 2018
Republican Party officeholders at the state and federal level controlled the presidency, Congress, and a majority of state governments entering the 2018 election. The party's 2018 primaries across the country were defined by the influence of groups affiliated with President Donald Trump, intraparty conflicts over tax reform and healthcare, and incumbent retirements that left seats open to newcomers. Ballotpedia covered every state and federal primary in 2018 to highlight the intraparty conflicts that shaped the party and the general election.
Ballotpedia identified 78 Republican federal and state battleground primaries in 2018.
Criteria
It is typically difficult to predict how competitive primaries will be until after filing deadlines take place. However, Ballotpedia used a number of factors to give insight into the most interesting 2018 primary elections. Factors that were used to determine the competitiveness of primaries included:
- Whether or not the seat was open (retiring or resigning incumbent)
- Notable endorsements of multiple candidates
- Significant fundraising from multiple candidates
- Number of candidates
- Incumbent's years in office (if seeking re-election)
- Whether or not the district's general election was expected to be a battleground
Republican battleground primaries
Senate
- United States Senate election in Indiana (May 8, 2018 Republican primary)
- United States Senate election in Arizona (August 28, 2018 Republican primary)
- United States Senate election in West Virginia (May 8, 2018 Republican primary)
- United States Senate election in Virginia (June 12, 2018 Republican primary)
- United States Senate election in Utah (June 26, 2018 Republican primary)
- United States Senate election in Montana (June 5, 2018 Republican primary)
- United States Senate election in Michigan (August 7, 2018 Republican primary)
- United States Senate election in Wisconsin (August 14, 2018 Republican primary)
House of Representatives
- Arizona's 1st Congressional District election (August 28, 2018 Republican primary)
- Alabama's 2nd Congressional District election (June 5, 2018 Republican primary)
- Ohio's 16th Congressional District election (May 8, 2018 Republican primary)
- Oklahoma's 1st Congressional District election (June 26, 2018 Republican primary)
- Pennsylvania's 13th Congressional District election (May 15, 2018 Republican primary)
- Michigan's 11th Congressional District election (August 7, 2018 Republican primary)
- Minnesota's 1st Congressional District election (August 14, 2018 Republican primary)
- South Carolina's 1st Congressional District election (June 12, 2018 Republican primary)
- South Carolina's 4th Congressional District election (June 12, 2018 Republican primary)
- Tennessee's 2nd Congressional District election (August 2, 2018 Republican primary)
- Tennessee's 6th Congressional District election (August 2, 2018 Republican primary)
- Tennessee's 8th Congressional District election (August 2, 2018 Republican primary)
- Texas' 2nd Congressional District election (March 6, 2018 Republican primary)
- Texas' 5th Congressional District election (March 6, 2018 Republican primary)
- Texas' 6th Congressional District election (March 6, 2018 Republican primary)
- Texas' 21st Congressional District election (March 6, 2018 Republican primary)
- Texas' 27th Congressional District election (March 6, 2018 Republican primary)
- Colorado's 5th Congressional District election (June 26, 2018 Republican primary)
- Connecticut's 5th Congressional District election (August 14, 2018 Republican primary)
- Nevada's 3rd Congressional District election (June 12, 2018 Republican primary)
- New Hampshire's 1st Congressional District election (September 11, 2018 Republican primary)
- New Jersey's 2nd Congressional District election (June 5, 2018 Republican primary)
- New Mexico's 2nd Congressional District election (June 5, 2018 Republican primary)
- North Carolina's 3rd Congressional District election (May 8, 2018 Republican primary)
- North Carolina's 9th Congressional District election (May 8, 2018 Republican primary)
- New York's 11th Congressional District election (June 26, 2018 Republican primary)
- Florida's 6th Congressional District election (August 28, 2018 Republican primary)
- Florida's 15th Congressional District election (August 28, 2018 Republican primary)
- Florida's 17th Congressional District election (August 28, 2018 Republican primary)
- Virginia's 6th Congressional District election (May 19, 2018 Republican convention)
- West Virginia's 3rd Congressional District election (May 8, 2018 Republican primary)
- Idaho's 1st Congressional District election (May 15, 2018 Republican primary)
- Indiana's 6th Congressional District election (May 8, 2018 Republican primary)
- Indiana's 4th Congressional District election (May 8, 2018 Republican primary)
- Kansas' 2nd Congressional District election (August 7, 2018 Republican primary)
- United States House election in South Dakota (June 5, 2018 Republican primary)
- Arizona's 8th Congressional District special election (February 27, 2018 Republican primary)
- Ohio's 12th Congressional District special election (May 8, 2018 Republican primary)
- Pennsylvania's 7th Congressional District election (May 15, 2018 Republican primary)
- Alabama's 2nd Congressional District election (July 17, 2018 Republican primary runoff)
- South Carolina's 4th Congressional District election (June 26, 2018 Republican primary runoff)
- Oklahoma's 1st Congressional District election (August 28, 2018 Republican primary runoff)
- New Jersey's 5th Congressional District election (June 5, 2018 Republican primary)
State Executive
- Ohio gubernatorial and lieutenant gubernatorial election, 2018 (May 8 Republican primary)
- Alabama gubernatorial election, 2018 (June 5 Republican primary)
- Arizona gubernatorial election, 2018 (August 28 Republican primary)
- Colorado gubernatorial and lieutenant gubernatorial election, 2018 (June 26 Republican primary)
- Connecticut gubernatorial election, 2018 (August 14 Republican primary)
- Florida gubernatorial and lieutenant gubernatorial election, 2018 (August 28 Republican primary)
- Georgia gubernatorial election, 2018 (May 22 Republican primary)
- Illinois gubernatorial and lieutenant gubernatorial election, 2018 (March 20 Republican primary)
- Kansas gubernatorial and lieutenant gubernatorial election, 2018 (August 7 Republican primary)
- Maine gubernatorial election, 2018 (June 12 Republican primary)
- Michigan gubernatorial and lieutenant gubernatorial election, 2018 (August 7 Republican primary)
- Minnesota gubernatorial and lieutenant gubernatorial election, 2018 (August 14 Republican primary)
- Oklahoma gubernatorial election, 2018 (June 26 Republican primary)
- Pennsylvania gubernatorial election, 2018 (May 15 Republican primary)
- South Carolina gubernatorial and lieutenant gubernatorial election, 2018 (June 12 Republican primary)
- South Dakota gubernatorial and lieutenant gubernatorial election, 2018 (June 5 Republican primary)
- Tennessee gubernatorial election, 2018 (August 2 Republican primary)
- Wyoming gubernatorial election, 2018 (August 21 Republican primary)
- Georgia gubernatorial election, 2018 (July 24 Republican primary runoff)
- South Carolina gubernatorial and lieutenant gubernatorial election, 2018 (June 26 Republican primary runoff)
- Oklahoma gubernatorial election, 2018 (August 28 Republican primary runoff)
- Georgia lieutenant gubernatorial election, 2018 (July 24 Republican primary runoff)
- Alabama lieutenant gubernatorial election, 2018 (July 17 Republican primary runoff)
- Alabama Attorney General election, 2018 (June 5 Republican primary)
- Florida Attorney General election, 2018 (August 28 Republican primary)
- Alabama Attorney General election, 2018 (July 17 Republican primary runoff)