What is the real difference in ideology between the SWP and the CPUSA? These are the two largest far-left parties in the United States by GE votes.
Since when? In 2012, the Party for Socialism and Liberation (aka the pro-Tiananmen Square massacre guys) and SPUSA were the top two. CPUSA and SWP seem to be even more dead than your standard American commie party these days.
But, in terms of ideology, CrabCake basically hit the nail on the head. One's a Castroist cult, and the other are Democrats who want to look edgy.