Voters in four states are heading to the polls Tuesday to vote in a slew of primaries that will help determine the makeup of the November ballot.

Rep. Nancy Mace (R-SC) is fighting for reelection as some members of her party work against her, including former House Speaker Kevin McCarthy.

Meanwhile, in Nevada’s GOP Senate primary, retired Army Capt. Sam Brown is looking to secure the Republican nomination to go against Sen. Jacky Rosen (D-NV) in November.