Marvin:
You are misunderstanding the struggles you cite above drawn from trade union, black, and women's history. The "revolutionaries" in each case were, as you would expect, far outnumbered by liberals, social democrats, and even conservatives - including at the leadership level - and in each instance they saw the Democrats, rightly or wrongly, as the party which would carry the demands they were demonstrating for into the legislative arena.
And you are misunderstanding the role of revolutionaries. Without communists, you never would have had sit-down strikes. Without communists, there never would have been an antiwar demo in 1965. These sorts of things don't fall from the skies, let alone from the Americans for Democratic Action. -- www.marxmail.org
