Why a Trump-Sanders debate would be disastrous for Hillary

We don't know with any certainty whether Bernie Sanders and Donald Trump will debate each other before the California primary on June 7. In the hours following Trump's positive response to the idea on Jimmy Kimmel Live on Wednesday night and Sanders' rapid-fire acceptance, it looked like a go. But then Trump's handlers (I'm looking at you Paul Manafort) got wind of it, and Team Trump quickly denied it would happen, saying the presumptive GOP nominee was "just kidding." Then Trump went on national TV on Thursday afternoon and said...