Republican presidential candidate Sen. Marco Rubio, R-Fla., acknowledges the audience at a caucus night celebration, Monday, Feb. 1, 2016 in Des Moines, Iowa.
Republican presidential candidate Sen. Marco Rubio, R-Fla., acknowledges the audience at a caucus night celebration, Monday, Feb. 1, 2016 in Des Moines, Iowa. Paul Sancya Associated Press
Republican presidential candidate Sen. Marco Rubio, R-Fla., acknowledges the audience at a caucus night celebration, Monday, Feb. 1, 2016 in Des Moines, Iowa. Paul Sancya Associated Press

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