Marco Rubio worries about 'Marco Polo'

Senate GOP hopeful Marco Rubio fired up conservatives so much during a speech on Thursday so much that they stated chanting, "Marco! Marco!"

A laughing Rubio said he is always worried about that rallying cry "because someone might say Polo."

Rubio, who is running against Florida Gov. Charlie Crist in the Senate Republican primary, addressed the Conservative Political Action Conference on Thursday.

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