Left-wing filmmaker Michael Moore may be lacking general political acumen, but perhaps he at least knows how to give a fairly accurate prognosis of events to come when it comes to Democratic politics. On Thursday, he issued Democrats a dire warning: Nominate former Vice President Joe Biden and risk alienating progressive voters come 2020. Writing a lengthy Twitter post, Moore first attacked Biden for attending a fundraiser hosted by Andrew Goldman, the founder of the natural gas company Western LNG, and argued that the former vice president is far too similar to Hillary Clinton. "Last night on CNN, a student...