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CEDAR RAPIDS, IA - JULY 17:  Democratic presidential candidate Senator Bernie Sanders (I-VT) speaks to guests at the Iowa Democratic Party's Hall of Fame Dinner on July 17, 2015 in Cedar Rapids, Iowa. All five democratic candidates who are seeking the party's nomination for president appeared at the event.  (Photo by Scott Olson/Getty Images)
CEDAR RAPIDS, IA - JULY 17:  Democratic presidential candidate Senator Bernie Sanders (I-VT) speaks to guests at the Iowa Democratic Party's Hall of Fame Dinner on July 17, 2015 in Cedar Rapids, Iowa. All five democratic candidates who are seeking the party's nomination for president appeared at the event.  (Photo by Scott Olson/Getty Images)

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Senator Bernie Sanders on State of the Union

Senator Bernie Sanders joins Jake Tapper on State of the Union to discuss DNC e-mail leaks, and his feelings on VP pick Tim Kaine.

Senator Bernie Sanders on State of the Union

Senator Bernie Sanders joins Jake Tapper on State of the Union to discuss DNC e-mail leaks, and his feelings on VP pick Tim Kaine.