The primary election in Ohio has set up what is expected to be one of the most expensive races for U.S. Senate this year as Republicans try to hold on to the chamber, while biotech billionaire Vivek Ramaswamy will face a challenge from the state’s former health director as he seeks to keep the governor’s office in GOP hands.

Democrat Chedrick Greene has won a special election in Michigan, securing the party’s control of the state Senate through the remainder of Gov. Gretchen Whitmer’s term.

Voters in a competitive central Michigan district will decide control of the state Senate on Tuesday in a special election to fill the seat last held by Democrat Kristen McDonald Rivet, who's now a congresswoman.