The tumultuous presidential primary season barreled toward a potentially decisive day for both Republicans and Democrats that could transform Donald Trump and Hillary Clinton from front-runners to likely nominees. The biggest prizes are Florida and Ohio, states with a long history of making or breaking White House aspirations. Missouri, Illinois, and North Carolina also offer a crucial cache of delegates to the parties' national nominating conventions that could help Trump and Clinton pull further away from their rivals. Trump holds a comfortable lead in the Republican delegate count and could put himself well on his way to securing the nomination if he sweeps Tuesday's contests. He would...
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