( KTRS ) Voters in Missouri will be making their presidential choices in what could be a pivotal primary election day for some candidates.

Polls will be open from 6 a.m. to 7 p.m. today for Missouri primary voters. Residents in Florida, Illinois, North Carolina and Ohio also are holding presidential primaries. Republican billionaire businessman Donald Trump and Texas Sen. Ted Cruz both campaigned in Missouri during the final days before the primary. So did Democrats Hillary Clinton, the former secretary of state, and Vermont Sen. Bernie Sanders.

Victories by Clinton and Trump could help shore up their national front-runner status. But victories by Cruz or Sanders could give them new momentum.