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The Rubio paradox

The presumed future front-runner has a major weakness that could cripple his chances at securing the Republican nomination.

Republican presidential candidate, Sen. Marco Rubio (R-FL) speaks at Civic Hall about the "sharing economy" on Oct. 6, 2015 in New York City. (Photo by Spencer Platt/Getty)
Republican presidential candidate, Sen. Marco Rubio (R-FL) speaks at Civic Hall about the "sharing economy" on Oct. 6, 2015 in New York City.Getty Images

Chuck Todd

Chuck Todd is NBC News' chief political analyst and the former moderator of "Meet The Press."

Mark Murray