Democratic presidential candidates Sen. Bernie Sanders, I-Vt, left, and Hillary Clinton take the stage before a Democratic presidential primary debate at the University of Wisconsin-Milwaukee on Thursday.
Democratic presidential candidates Sen. Bernie Sanders, I-Vt, left, and Hillary Clinton take the stage before a Democratic presidential primary debate at the University of Wisconsin-Milwaukee on Thursday. Tom Lynn AP
Democratic presidential candidates Sen. Bernie Sanders, I-Vt, left, and Hillary Clinton take the stage before a Democratic presidential primary debate at the University of Wisconsin-Milwaukee on Thursday. Tom Lynn AP