

republicans never vote for democrats, yet democrats never stop chasing their votes.
the left wing are far more reliable voters for democrats than the republicans whose votes centrists envy. And their votes are actually gettable. You know their issues.
I vote in primaries. I also see how, in local races, the party pulls out all the stops to stop progressive challengers to conservative incumbents, an advantage not afforded to progressive incumbents with conservative challengers.