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DES MOINES, IA - FEBRUARY 1 : Democratic presidential candidate Bernie Sanders stands on stage with his wife Jane OÕMeara Sanders during his Caucus night event at the at the Holiday Inn February 1, 2016 in Des Moines, Iowa. Sanders was in a virtual tie with Secretary of State Hillary Clinton late in caucus polling. (Photo by Joshua Lott/Getty Images)
DES MOINES, IA - FEBRUARY 1 : Democratic presidential candidate Bernie Sanders stands on stage with his wife Jane OÕMeara Sanders during his Caucus night event at the at the Holiday Inn February 1, 2016 in Des Moines, Iowa. Sanders was in a virtual tie with Secretary of State Hillary Clinton late in caucus polling. (Photo by Joshua Lott/Getty Images)

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Bernie Sanders' big test in Michigan

'Inside Politics' panelists discuss the big tests for Sanders and Clinton in Michigan on Tuesday.

Bernie Sanders' big test in Michigan

'Inside Politics' panelists discuss the big tests for Sanders and Clinton in Michigan on Tuesday.