"Progressives should not make the same mistake that Ernst Thälmann made in 1932. The leader of the German Communist Party, Thälmann saw mainstream liberals as his enemies, and so the center and left never joined forces against the Nazis. Thälmann famously said that ‘some Nazi trees must not be allowed to overshadow a forest’ of social democrats, whom he sneeringly called ‘social fascists.’
After Adolf Hitler gained power in 1933, Thälmann was arrested. He was shot on Hitler’s orders in Buchenwald concentration camp in 1944."
Yes, but you’re going to need to find a way to think beyond that, because both parties understand that it’s in their interests to oppose rcv, so “vote democrat until we get rcv” effectively means “vote democrat forever”.
Fundamentally, there is a limit to the extent that a capitalist democracy will tolerate actual democratic power, because eclipsing the power of capitalists obviously means threatening their position. They will not sit idly by and allow their power to be voted away.