Indiana voters head to the polls Tuesday for primaries that will determine nominees for all nine U.S. House seats and dozens of state legislative races. Intraparty fights, particularly among Republicans, will shape some of the most closely watched contests in the 2026 midterm elections.
What’s on the ballot
Indiana’s primary is open, meaning voters do not have to be registered with a party to participate. However, if a voter selects a Republican ballot, they will only have access to GOP candidates and will not have a say in the Democratic primary.
The election will decide nominees for all nine U.S. House districts, all 100 Indiana House seats, and about half of the state Senate.
Because many districts lean heavily Republican or Democratic, the primary often effectively determines the eventual officeholder.
FOUR TAKEAWAYS FROM THE FIRST PRIMARY ELECTION OF 2026
Redistricting fight fuels primary drama
A failed push in 2025 to redraw Indiana’s congressional map, backed by President Donald Trump, is looming over many of these races.
Republican leaders considered mid-decade redistricting that could have strengthened their hold on Congress by targeting Democratic-held seats.
The state Senate voted down Trump’s push to redistrict Indiana and give the GOP two more House seats in the midterm elections, triggering backlash from Trump and his allies.
That fallout has spilled into the primaries, where some Republican incumbents who opposed the effort are now facing challengers backed by Trump-aligned groups.
The disputes have intensified already competitive primaries and injected national political dynamics into local races.
U.S. House races: Who’s running and what’s competitive
Indiana’s congressional map remains heavily tilted toward Republicans, who hold seven of the state’s nine seats. Most districts are considered safe, with only one drawing consistent attention as competitive.
In the 1st Congressional District in northwest Indiana, Democrats are defending what has historically been a reliably blue seat. The 2024 election results give signs that the seat could be on the brink of flipping, as Kamala Harris won the seat by less than one percentage point.
Rep. Frank Mrvan (D-IN) is seeking reelection in what is expected to be the state’s most competitive race. He is one of only two Democrats in the state’s congressional delegation and was the target of Trump’s redistricting push to turn the area red.
Mrvan faces only one challenger in the Democratic primary, former Gary City Councilwoman LaVetta Sparks-Wade, and is likely to win his primary. Republicans have fielded multiple challengers in the primary, including Porter County Commissioner Barb Regnitz, small business owner David Ben Ruiz, and a former communication manager Jim Schenke.
According to Cook Political Report, Mrvan is likely to win in the general election, but the margin could give way for a future Republican flip.
Indiana’s 2nd, 3rd, 4th, 5th, 6th, 8th, and 9th Congressional Districts are rated as safely Republican by CPR. These districts are dominated by Republicans and are generally considered safe for the GOP in November.
Republican Reps. Rudy Yakym, Marlin Stutzman, Jim Baird, Victoria Spartz, Jefferson Shreve, Mark Messmer, and Erin Houchin are all seeking reelection to GOP-safe seats and are likely to win in November.
Primaries in these districts are largely about choosing the Republican nominee, with some incumbents facing right-wing challengers amid broader party tensions.
Spartz’s 5th Congressional District, which includes suburban Indianapolis, is strongly Republican, but has drawn attention for crowded primaries and internal party competition.
While she is the front-runner, Spartz could face some trouble in the primary as she has spoken out against House Speaker Mike Johnson, and multiple staffers have reported her “verbal abuse” to the House ethics committee.
In the Hoosier State’s 7th Congressional District, which includes Indianapolis and is safely Democratic, Rep. Andre Carson (D-IN) is running for reelection but faces a competitive Democratic primary with multiple challengers, including Destiny Wells and George Hornedo.
Carson succeeded his grandmother, Rep. Julia Carson, following her death in 2007. He hasn’t faced much opposition in his 18-year tenure, but he has fallen behind on the fundraising front, especially during this year’s campaign. He raised $120,000 in the first quarter and ended March with $500,000 in his campaign account.
Republicans have also fielded candidates, but the district remains safely Democratic.
Across the map, few seats are expected to flip parties in November, but several primaries, mostly on the Republican side, will determine how ideologically conservative the delegation becomes.
State legislative races: Where the real fights are
The most intense competition is in state legislative primaries, especially among Republicans, who hold supermajorities in both chambers.
In the Indiana House, all 100 seats are up for election, with a mix of incumbents, challengers and open-seat contests.
In the state Senate, multiple Republican incumbents are also facing challengers.
Because of the redistricting failure in the state Senate, Trump is on a revenge tour, endorsing state Senate candidates challenging sitting Republicans.
TRUMP ENDORSEMENT TRACKER: HERE’S WHO THE PRESIDENT HAS PICKED IN GOP MIDTERM ELECTION PRIMARIES
The internal Republican divide is most clear in first-term state Sen. Spencer Deery’s (R-IN) district, as Deery opposed the redrawn maps. The president looked to Paula Copenhaver to challenge Deery.
Copenhaver is a staffer for Lt. Gov. Micah Beckwith, who was the first statewide elected official to endorse Trump’s redistricting effort and has campaigned with the Republicans challenging Senate incumbents.
Trump has also endorsed Tracy Powell, Blake Fiechter, Jeff Ellington, Brenda Wilson, and Michelle Davis, who are all challenging sitting Republicans for state senate seats.
These contests are being closely watched as a measure of ideological shifts within the state GOP and Democratic efforts to remain competitive in key areas.