The Democratic Party's present panic says they know he can.
Leading liberals and progressive groups are turning their gaze away from the Democratic primary and toward efforts to unite the left against Donald Trump, framing him as a dangerous and unprecedented candidate who poses an existential threat to the progressive movement and the nation.
Ad campaigns are in the works. There are calls for massive voter mobilizations and screeds from leading donors circulating within liberal circles. Major labor groups are organizing their members on the ground in swing states. Within the Democratic Party apparatus, top elected leaders are beginning to speak out both collectively and individually in ways that reach beyond standard presidential-year posturing. The sense of urgency in some corners of the left is high enough that Massachusetts Sen. Elizabeth Warren, a progressive icon who has gone to great lengths to avoid being part of the Democratic presidential conversation in 2016, hinted on Monday that she might soon get involved with the effort to stop Trump.
Thus far, every attempt to stop Trump has swelled his support.
Are Dems about to propel Trump support to even higher levels?