In the face of all evidence to the contrary, MSNBC host Andrea Mitchell claimed on Thursday that allegations that Democratic National Committee chair Donna Brazile leaked town hall questions to the Clinton campaign have been “completely knocked down.”Mitchell was discussing references Donald Trump made on Thursday to leaked debate and town hall questions. Trump claimed on Twitter that questions from Wednesday’s debate, moderated by Fox News’ Christopher Wallace, were provided to the Clinton campaign.On Thursday, he referred to the scandal involving Brazile and her apparent leaking of a CNN/TV One town hall question asked of Clinton in March.“That was...