The above is a picture of Clio, the muse of history. Below is another polemic from Tom in the Canel/Lafferty debate.
What is about to follow is a theory of American history and the emergence of mass movements that I hold. It is actually not my theory, but instead is based on a theory of Samuel P Huntington, who is not especially keen on progressive mass movements.
According to this theory, mass movements in America only emerge when liberal values are hegemonic and institutions/social reality does not live up to those liberal values. The way that liberal values become hegemonic is by having overt liberals elected in national elections, even if you don't like liberals very much. Therefore if you want a mass movement to emerge in the near future, you need to ensure that Obama or Clinton beat McCain in November. If McCain wins, there won't be any mass progressive movements even if Nader gets a bunch of votes.