University of Wisconsin-Milwaukee
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Democratic presidential candidates debate at the University of Wisconsin-Milwaukee

University of Wisconsin-Milwaukee

Candidates Sen. Bernie Sanders and Hillary Clinton argue a point during the Democratic presidential primary debate at the University of Wisconsin-Milwaukee.

 (Morry Gash / Associated Press)
University of Wisconsin-Milwaukee

Democratic presidential candidates Hillary Clinton and Bernie Sanders participate in the PBS NewsHour Presidential Primary Debate in Milwaukee, Wis.

 (Tasos Katopodis / AFP/Getty Images)
University of Wisconsin-Milwaukee

Democratic presidential candidate Hillary Clinton participates in the PBS NewsHour Presidential Primary Debate with Bernie Sanders in Milwaukee, Wis.

 (Tasos Katopodis / AFP/Getty Images)
University of Wisconsin-Milwaukee

Presidential candidate Sen. Bernie Sanders participates in the PBS NewsHour Democratic debate at the University of Wisconsin-Milwaukee.

 (Win McNamee / Getty Images)
Democratic debate, University of Wisconsin-Milwaukee

Democratic presidential candidates Bernie Sanders and Hillary Clinton take the stage for their debate at the University of Wisconsin-Milwaukee in Wisconsin. 

 (Win McNamee / Getty Images)
Democratic debate, University of Wisconsin-Milwaukee

The candidates during the early moments of their debate in Milwaukee. 

 (Scott Olson / Getty Images)
Democratic debate, University of Wisconsin-Milwaukee

Bernie Sanders addresses a question. 

 (Scott Olson / Getty Images)
Democratic debate, University of Wisconsin-Milwaukee

Hillary Clinton during the debate. 

 (Win McNamee / Getty Images)
Democratic debate, University of Wisconsin-Milwaukee

Bernie Sanders and Hillary Clinton square off in the debate, hosted by PBS. 

 (Morry Gash / Associated Press)
Democratic debate, University of Wisconsin-Milwaukee

Hillary Clinton supporters gather outside the debate in Milwaukee. 

 (Win McNamee / Getty Images)
Democratic debate, University of Wisconsin-Milwaukee

A Bernie Sanders supporter on debate night. 

 (Win McNamee / Getty Images)
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