Polls have closed and results are coming in from the Republican and Democratic primaries in five states: North Carolina, Ohio, Florida, Illinois, and Missouri.
So far, Donald Trump has won three states (Florida, North Carolina, and Illinois), John Kasich has won one state (Ohio), and Hillary Clinton has won four states (Florida, North Carolina, Illinous and Ohio). Missouri remains too close to call for either party, though Clinton and Trump are leading.
Because those five states together contain nearly 20 percent of the US population, and because they're rich in delegates, today has been dubbed the second Super Tuesday of the 2016 campaign.
Tonight's Republican primaries include the first winner-take-all states, where candidates who win get all of the states' delegates rather than a number based on the proportion of the vote they received. This means winning Illinois, Florida, and Ohio is a really big deal.
Florida: Trump wins, Clinton wins
Republican delegates at stake: 99 (need 1,237 to win nomination), winner-take-all
Democratic delegates at stake: 214 (need 2,383 to win nomination), awarded proportionally
North Carolina: Clinton wins, Trump wins
Republican delegates at stake: 72 (need 1,237 to win nomination), awarded proportionally
Democratic delegates at stake: 107 (need 2,383 to win nomination), awarded proportionally
Ohio: Clinton wins, Kasich wins
Republican delegates at stake: 66 (1,237 to win nomination), winner-take-all
Democratic delegates at stake: 143 (2,383 to win nomination), awarded proportionally
Illinois: Trump wins, Clinton wins
Republican delegates at stake: 69 (1,237 to win nomination). Most delegates elected directly in congressional districts.
Democratic delegates at stake: 156 (2,383 to win nomination), awarded proportionally
Missouri: Polls closed 8 pm Eastern (7 pm local time)
Republican delegates at stake: 52 (1,237 to win nomination), awarded based on winners in congressional districts
Democratic delegates at stake: 71 (2,383 to win nomination), awarded proportionally
Republican outlook: The race is extremely tight with Donald Trump holding a very narrow lead and more ballots still being counted.
Democratic outlook: The race is extremely tight with Hillary Clinton holding a very narrow lead and more ballots still being counted.