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DES MOINES, IOWA - FEBRUARY 1: Republican presidential candidate, Sen. Marco Rubio (R-FL) addresses supporters at a caucus night party at the Marriott hotel on February 1, 2016 in Des Moines, Iowa. Republican and Democratic candidates for President of the United States are awaiting the first primary voting in the 2016 Presidential Election.  (Photo by Pete Marovich/Getty Images)
DES MOINES, IOWA - FEBRUARY 1: Republican presidential candidate, Sen. Marco Rubio (R-FL) addresses supporters at a caucus night party at the Marriott hotel on February 1, 2016 in Des Moines, Iowa. Republican and Democratic candidates for President of the United States are awaiting the first primary voting in the 2016 Presidential Election.  (Photo by Pete Marovich/Getty Images)

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Bardach: Democrats 'are fearing Marco Rubio more'

Journalist and Author Ann Louise Bardach speaks with CNN's Christiane Amanpour about the American race for president in the wake of the Iowa caucuses.

Bardach: Democrats 'are fearing Marco Rubio more'

Journalist and Author Ann Louise Bardach speaks with CNN's Christiane Amanpour about the American race for president in the wake of the Iowa caucuses.