“But the Dems aways unite in the general election you dont see Dem factions feuding and staying home, which is quite usual for GOP and conservative voters.”
DUDE, you are so wrong - remember the Blue Dog democrats who voted for Ron Reagen?
I vote FOR the person who shares my view of the world. I no longer vote for the lesser of two evils
But, having said that, you also have to recognize that the leftwing turned out big for Obama in 2012 even though the left was not pleased with Obama's first term.