There is one big storyline heading into Wednesday’s Republican debate at the Ronald Reagan Presidential Library — Donald Trump against all comers. But there are subplots aplenty. Just about everyone onstage has something to prove.
Gwen Ifill is moderator and managing editor of "Washington Week" and co-anchor and managing editor of the "PBS NewsHour." The best-selling author of "The Breakthrough: Politics and Race in the Age of Obama," Gwen has covered seven presidential campaigns and moderated two vice presidential debates.