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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.
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Two of the Republican candidates said Saturday they may no longer support Donald Trump should he become the nominee following the violent events at a Trump rally in Chicago on Friday night.
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Sen. Marco Rubio's presidential ambitions come down to a win in his home state of Florida. But his rival Donald Trump began creating a Florida operation months ago.
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"If you are a Republican primary voter in Ohio and you want to defeat Donald Trump, your best chance in Ohio is John Kasich," Rubio spokesman Alex Conant said on Friday.
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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.
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Bernie Sanders pulled off an upset in Michigan, but Hillary Clinton handily took Mississippi. On the Republican side, Donald Trump racked up three more victories and Ted Cruz won in Idaho.
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The Florida senator got 71 percent of the vote in the U.S. territory's GOP primary and will earn all of its 23 delegates.
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The Texas senator has won the straw poll at the Conservative Political Action Conference. Donald Trump, who canceled his appearance at the last minute, finished a distant third.
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What is coming looks more like the historic schism of 1912, when former President Theodore Roosevelt came back to challenge the re-election of his successor and fellow Republican, William H. Taft.
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Marco Rubio and Ted Cruz allied to gang up on Donald Trump as he was pressed on immigration and foreign policy. John Kasich tried to rise above the fray in the nastiest GOP debate yet.