Several states are holding primary elections Tuesday, including some contests that could prove pivotal in determining whether Republicans or Democrats will control the Senate next year.

A tight special U.S. House election also is being held in Ohio as a young Democrat hopes to upset a Republican who has garnered the support of President Trump, Ohio Gov. John Kasich and other party leaders.

Early Tuesday, Trump urged Ohio voters to get out and vote for Republican State Sen. Troy Balderson for Congress, over his opponent, Democrat Danny O'Connor. 

"Ohio, vote today for Troy Balderson for Congress. His opponent, controlled by Nancy Pelosi, is weak on Crime, the Border, Military, Vets, your 2nd Amendment - and will end your Tax Cuts. Troy will be a great Congressman. #MAGA[1]," Trump tweeted early Tuesday. 

The Ohio race and others could put Trump’s influence to the test. Read on for a preview of some of the major elections on Tuesday.

Missouri

missouri senate candidates

Air Force veteran Tony Monetti, Missouri Attorney General Josh Hawley and former Libertarian Party presidential contender Austin Petersen are vying for the GOP nomination for Republican governor in Missouri.

Republicans are set to pick their candidate to take on Sen. Claire McCaskill, the Democratic incumbent, in the fall. McCaskill has represented Missouri in the Senate since 2007, but Fox News has her bid for re-election rated as a toss-up[2].

Out of a crowded field of Republican candidates, Missouri Attorney General Josh Hawley has emerged as a favorite, even securing Trump’s endorsement[3] months before the primary election.

A lawyer who helped

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