Voters head to the polls Tuesday in Florida, Ohio, Missouri, Illinois, and North Carolina, with one of the biggest delegate hauls of the primary season at stake. On the Democratic side, frontrunner Hillary Clinton is favored in delegate-rich Florida and several other states, while her rival Sen. Bernie Sanders is hoping for upsets to erode her lead. Among Republicans, Ohio Gov. John Kasich and Sen. Marco Rubio of Florida are fighting in their home states to keep their campaigns alive. Kasich is neck-and-neck in Ohio with national frontrunner Donald Trump, who is favored in the other four states, while Rubio trails far back in Florida.