Leading candidates for top-of-the-ticket offices in Michigan such as governor and an open U.S. Senate seat are expected to face little or no opposition in the August primary.
But retirements are leading to spirited primaries in all but one of four open U.S. House seats - the state's most open congressional races in 22 years. Two incumbent Republican congressmen are facing serious primary challenges, too.
Tuesday is the deadline for Democratic and Republican candidates to file signatures to run for most state offices.
First-term Republican Gov. Rick Snyder and Democratic challenger Mark Schauer are looking beyond August to November's general election with no serious primary challengers. So are Republican Terri Lynn Land and Democrat Gary Peters, who are vying to succeed retiring Sen. Carl Levin in a close race.