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DES MOINES, IA - FEBRUARY 01:  Democratic presidential candidate former Secretary of State Hillary Clinton speaks to supporters as Former U.S. president Bill Clinton and daughter Chelsea Clinton look on during her caucus night event in the Olmsted Center at Drake University on February 1, 2016 in Des Moines, Iowa. Clinton is competing with Sen. Bernie Sanders (I-VT) in the Iowa Democratic caucus.  (Photo by Justin Sullivan/Getty Images)
DES MOINES, IA - FEBRUARY 01:  Democratic presidential candidate former Secretary of State Hillary Clinton speaks to supporters as Former U.S. president Bill Clinton and daughter Chelsea Clinton look on during her caucus night event in the Olmsted Center at Drake University on February 1, 2016 in Des Moines, Iowa. Clinton is competing with Sen. Bernie Sanders (I-VT) in the Iowa Democratic caucus.  (Photo by Justin Sullivan/Getty Images)

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Hillary Clinton: 'Thrilled' over Iowa win

Democratic presidential candidate Hillary Clinton talks to CNN's Wolf Blitzer about her victory in the Iowa caucuses.

Hillary Clinton: 'Thrilled' over Iowa win

Democratic presidential candidate Hillary Clinton talks to CNN's Wolf Blitzer about her victory in the Iowa caucuses.