President Trump may or may not be giving the Democrats a boost on Capitol Hill this year. What they care about most are next year's Congressional elections… and the Presidential election in 2020. But this week, there were two blasts from the past. In New York, crowds lined up around the block this week for Hillary Clinton's first signing of her new book, What Happened. In Washington, a gaggle of potential presidential hopefuls lined up behind Bernie Sanders and his new proposal of Medicare for All. Has Sanders discovered "The Issue" for 2020? Does Clinton still have a role to play? Democrats don't want to re-live last year's primaries, but divisions between grass roots activists and Party regulars are still a threat to Party unity.