WASHINGTON (AP) — The retirements of two of Iowa’s most prominent Republican officeholders, Gov. Kim Reynolds and U.S. Sen. Joni Ernst, have had ripple effects throughout Tuesday’s state primary, creating competitive nomination contests to replace them and a chain reaction of open seats down the ballot.

The winners will compete in November’s critical midterm elections, in which Iowa’s U.S. Senate and House seats could determine control of the narrowly divided chambers. The next governor could also play a pivotal role in the 2028 election, given the state’s long history of making or breaking presidential hopefuls.