That has been disproven. He ran again in primaries during 2020 and did horribly there. The progressives are just not popular, and they don't really do much to work with the rest of the Democrats. Unlike Republicans, where the party forerunner basically gets unilateral support from everyone Republican including those he personally insulted or harmed.

Alternatively, it could have been over long ago with a lot less loss of life, if Ukraine had been supported more full-throatedly, instead of allowing to drag on as it has.

Sometimes you gotta rip that bandaid off.

supporting Ukraine has always been in America's interests. How embarassing it must be for Trump to be publicly humiliated by Putin over a cease fire.

Sanders is old enough to remember what appeasement leads to, that's all.