Alaska voters will deliver the first statewide verdict Tuesday in one of the most closely watched Senate contests of the midterm elections, offering an early measure of Republican Sen. Dan Sullivan (R-AK) and former Democratic Rep. Mary Peltola before their expected showdown this fall.

Sullivan and Peltola are the clear front-runners in a crowded 16-candidate field competing in Alaska’s unusual nonpartisan primary, where candidates from every party appear on the same ballot and the top four vote-getters advance to November.

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