rubio

Clinton won big; Trump continued his triumphant streak, with the notable exception of Kasich's win in Ohio; Rubio dropped out after a dismal showing in Florida. What that means, in five stories.

The contests taking place in five states could winnow the GOP field and determine each party's presidential nominees. More than 1,000 delegates are at stake. Here's what to watch in each state.

Although at least one more debate is scheduled for March 21, Thursday's had the feeling of a finale. The themes were mostly policy oriented, with a few tiffs over who's likeliest to win in November.

Donald Trump and Hillary Clinton are expected to roll to victories in the South, leaving their rivals trying to scrape for wins elsewhere on the biggest voting day of the year so far.

Trump's successes endanger both Cruz and Rubio. Will this be the debate where they stop fighting each other and take on Trump?

The Florida senator needs a rebound in the state's GOP primary after a disappointing New Hampshire finish. And he's hoping the backing of the state's young, diverse leadership can help him do that.

Marco Rubio was the surprise beneficiary of heavy GOP turnout and made the fight for evangelicals a three-way contest. Bernie Sanders won with younger voters, but not enough voted for him to win.

Hillary Clinton has won the Iowa Democratic caucuses, according to the Iowa Democratic Party. On the Republican side, Ted Cruz upended Donald Trump, while Marco Rubio finished a strong third.