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Republican presidential candidate Donald Trump speaks to supporters during a rally at Valdosta State University February 29, 2016 in Valdosta, Georgia. On the eve of the Super Tuesday primaries, Trump is enjoying his best national polling numbers of the election cycle, increasing his lead over rivals Sens. Marco Rubio (R-FL) and Ted Cruz (R-TX).
Republican presidential candidate Donald Trump speaks to supporters during a rally at Valdosta State University February 29, 2016 in Valdosta, Georgia. On the eve of the Super Tuesday primaries, Trump is enjoying his best national polling numbers of the election cycle, increasing his lead over rivals Sens. Marco Rubio (R-FL) and Ted Cruz (R-TX).

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Rubio 'very concerned' someone might be killed at rally

Sen. Marco Rubio discusses the recent violence at Donald Trump rallies.

Rubio 'very concerned' someone might be killed at rally

Sen. Marco Rubio discusses the recent violence at Donald Trump rallies.