California's 13th Congressional District nonpartisan primary on June 7
Republican John Duarte, Democrat Adam Gray, Democrat Phil Arballo, Republican David Giglio and Republican Diego Martinez
Projected winners: Republican John Duarte and Democrat Adam Gray
Nevada's 4th Congressional District Republican primary on June 14
Sam Peters, Annie Black and Chance Bonaventura
Projected winner: Sam Peters
Illinois' 17th Congressional District Democratic primary on June 28
Eric Sorensen, Litesa Wallace, Jonathan Logemann, Angie Normoyle, Marsha Williams and Jacqueline McGowan
Projected winner: Eric Sorensen
Colorado's 8th Congressional District Republican primary on June 28
Barbara Kirkmeyer, Jan Kulmann, Lori Saine and Tyler Allcorn
Projected winner: Barbara Kirkmeyer
Arizona Republican secretary of state primary on Aug. 2
Mark Finchem, Beau Lane, Shawnna Bolick and Michelle Ugenti-Rita
Projected winner: Mark Finchem
Read more in MSNBC's key midterms match-up guide.