Venom
Philosopher
Not to pick on you directly, but the exact same thing the Progressives hope to accomplish in regards to your hated "Centrists."
No the Progressive Wing of the Democratic Party knows full well it can't stand against the GOP without the more moderate old guard folks. "Well we'll just form our own party!" is a threat hoping to get more power and influence within the party.
Nobody who threatens to take their ball and go home really wants the game to end or the teams they change. They just want to be coach instead of the 3rd baseman.
That's really more of the fringe progressives who aren't actually in office who take that hardline stance.