They have one thing in common: the understand they can get most of what they want by voting as a block, instead of demanding their candidates tick all the boxes.

Leftist infighting is the best tool the right has. And they know it. Whenever you see a leftist saying they won’t vote for a Democrat because “both sides are the same”, there’s a good chance you’re seeing a Russian bot or a right wing plant. Or a fucking idiot. I guess that’s a possible third option.