"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."
Problem is that RCV will only have a chance in deep blue states, and all it would accomplish is reducing the blue representation in congress.
To put it bluntly, all it would accomplish is more in fighting and contributing to the reputation that Dems are ineffective. Except, it would be the “blue aligned coalition” instead of “Dems”
The only real path to making this change is to give Dems a super majority so they can amend the constitution.
And, well, the minority of Red voters have a majority of power thanks to the electoral college, so a super majority is absolutely impossible for the foreseeable future.
Edit - it’d also cause disruptions in States that don’t adopt RCV, as “progressives” protest vote 3rd party and sandbag the Dems