Okay, Bernie Sanders is in the race and just tied with Hillary Clinton in the Iowa Caucus. If he wins, Bernie says, we need a movement to achieve a "political revolution".

Seems to me we need a movement even more if Bernie doesn't win.

Who's going to organize it? Will MoveOn, Occupy, Black Lives Matter, the splintery leftist and socialist groups, the many single interest groups interested only in guns, immigration, women's rights, etc. all join together?  How about what's left of the American unions?  

Maybe Bernie's campaign organization? Obama said much the same thing in 2008 according to Robert Reich but his campaign organization, “Organizing for America”, morphed into “Organizing for Action” and essentially became a PAC for obamas 2012 election.