I mean, yeah, but half of that fight was lost when Sanders lost, and the other half was lost when the GOP (probably) held the Senate. Nothing remotely left-wing is happening for two years, minimum. And only a miraculous midterm will save it from being longer than that.
OMB is pretty much the most powerful economic office in the White House, and the biggest factor in that job is going to be the person's attitude toward the deficit. Dodging someone who has worked on any one of the various "let's cut social security to pay down the debt" projects of the past thirty years is as big a win as you're going to get at this point in the game.
I don't know that this is a forced choice between social security cuts and extracting resources from countries we bomb