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Marco Rubio

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Secret Service agents had to form a protective cordon around Donald Trump when a man tried to rush the stage at a rally for the Republican presidential front-runner

Secret Service agents had to form a protective cordon around Donald Trump when a man tried to rush the stage at a rally for the Republican presidential front-runner. The already high tensions at Trump's rallies escalated in recent days with a Trump rally in Chicago being postponed due to security concerns. Dean Reynolds has more.

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Democratic presidential candidate Hillary Clinton apologized for her praise of the Reagan administration record on AIDS and HIV Friday after online backlash

Democratic presidential candidate Hillary Clinton apologized for her praise of the Reagan administration record on AIDS and HIV Friday after online backlash. In a television appearance ahead of Nancy Reagan's funeral, Clinton initially lauded President and Mrs. Reagan for starting a "national conversation" about AIDS. However, critics in the LGBT community attacked Clinton for overlooking the Reagan administration's initial dismissal of the AIDS epidemic. CBS News' Vladimir Duthiers has the details.

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Marco Rubio has had an underwhelming run since Super Tuesday on March 1

Marco Rubio has had an underwhelming run since Super Tuesday on March 1. Should he lose the Florida Primary next Tuesday, the Republican candidate may be forced to drop out. His rivals -- front-runner Donald Trump and Sen. Ted Cruz -- have suggested Rubio bow out before Florida votes, saving him the embarrassment of a loss. CBS News' Steve Chaggaris and Washington Post's Catherine Rampell join CBSN with more on Rubio's chances.

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After the dust was settled and Ted Cruz and Donald Trump chalked up additional victories, do John Kasich and Marco Rubio have a viable path to the nomination or is it the end of the road?

After the dust was settled and Ted Cruz and Donald Trump chalked up additional victories, do John Kasich and Marco Rubio have a viable path to the nomination or is it the end of the road? Citizens United President David Bossie, CBSN Political Contributor Rick Davis, CBS News Senior Political Editor Steve Chaggaris, CBSN Political Contributor Lynda Tran, and Democratic Strategist Jessica Tarlov discuss.

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