 Registered voters can cast their ballots for Republican and Democratic primaries in numerous state and federal races by voting early in person or by requesting a ballot through the mail. The widest-reaching statewide primary is for the U.S. Senate. Eight Republicans are vying for their party's nomination, while four Democrats are challenging incumbent Senator Amy Klobuchar. Ballots have to be received ahead of 8 p.m. on August 13th. Voters can track their ballot on the Secretary of State's website. I'm Clay Masters in St. Paul.