Governing in a sustainable way usually means big tent politics with give and take on the small stuff. Bill Clinton epitomized that style.
Are you talking about US politics here? I don't see anything that would get close to "left", so "far left"... unless they reach the far left by going enough to the right I guess?
In rare and extreme circumstances it makes sense to have a revolution because the people are oppressed. For the rest of history, revolutionary fervor always comes from power hungry psychopaths who'd jail and kill everyone that stands in their way and then rule perpetually over everyone that's left if they could.
Thankfully, their time is usually short. They had a good run this time, very sneaky and devilish, but back to the political desert they go.