Tuesday, March 15 is the third iteration of major states voting in a cluster to determine the presidential nominees for the Republican and Democratic parties. Florida, Ohio, Illinois, Missouri, and North Carolina all vote on this day—and several of the states will play a key role in determining whether frontrunners Hillary Clinton and Donald Trump will will their respective nods.

The polls open in Florida at 7 a.m. ET and close at 7 p.m. (with some parts of the state's panhandle opening and closing at 8 a.m. and p.m.). Illinois's and Missouri's polls run from 7 a.m. to 8 p.m. ET. North Carolina and Ohio run from 6:30 a.m. to 7:30 p.m. ET.

Ohio and Florida are considered the most crucial states in the Republican race—both are winner-takes-all votes and if Trump wins neither, the chances of a brokered convention increase significantly. On the Democratic side, Illinois is considered the most crucial ballot, as polling shows it a tight race and the blue state awards 182 delegates. Overall there are 367 delegates at stake for the GOP; and a whopping 792 are available for the Dems.

For live results, check your local listings for cable news networks like Fox News, CNN, or MSNBC—as well as your local broadcast networks, should you be in one of the states voting on Tuesday.

Those without a TV can follow along on the Associated Press's "Election Buzz" page or Politico's interactive primary map. Or you can check out CBS News's live feed here; or ABC News' live coverage, starting at 6 p.m. ET, below: