So, this is now the entire debate in Washington right now. Some of it is "Insurgent v Establishment" but particularly online, it's really Center v Left. Jon Chait notes how pervasive the argument that more leftwing candidates did great is - even though all the evidence points in the opposite direction. Yglesias, too, has been flogging this basic fact: moderate candidates outperformed more ideologically extreme candidates.
What I do think is interesting is trying to unpack what constitutes Center v Left. For Sanders, all left wing positions are economic. However, Democratic bastion California defeated a proposed one-time wealth tax. This was a direct measure of the appetite of the voting public for a particularly Sanders-like policy, and in the bluest of states. It still failed.
If there is a place where Democrats really understand the need to moderate, it really seems to be on cultural issues. Lots of ballot measures and successful candidates reinforced the idea that this really isn't the moment for aggressive trans-rights positions. That could very well change over time, but it's also worth noting that the entire closing GOP argument was attacking trans people, and that didn't work either. The "moderate" position would seem to be "Let adults express their gender who they want, but maybe leave kids out of it."
The thing is, I bet Sanders would agree with that. As a committed adherent of leftwing economics, Sanders doesn't exert himself on the sort of cultural issues that animate a large share of VERY progressive spaces. So is Sanders "moderating" by not talking about issues of gender, race or things like gun rights? What exactly do we mean by "Center" and "Left" when we make these huge online arguments?
The uncomfortable reality seems to be that people are indeed pissed about prices and corruption. They don't like the cruelty and the crassness in the Oval Office. Culturally, this isn't a mandate for pronouns in your email signature or revivifying Affirmative Action. But even economically - if we look at California's rejection of the wealth tax - it's unclear that people are clamoring for a more aggressive tax regimen. Then again, people want all of the government programs that they can get without having to pay for it. Not sure how that will work.
There is not a coherent Left, and not just because there has never been a "coherent Left" in the history of the world. Factionalism is the persistent state of left of center politics. The incoherence between a Sanders-style advocacy for a larger welfare state and the sort of cultural progressivism that was rightly or wrongly attached to Kamala Harris is really significant though.
I've argued for years that Trump's political superpower was running against more qualified women, but beating them by energizing a latent misogyny in the electorate. I do wonder, though, if it isn't the sort of vibe-based shorthand at work that reflexively attaches more leftwing social positions to women than men. Harris was triply damaged as a Black Woman From California. You can't get more reflexively culturally left than that - even if her policies were not the caricature that they were made out to be.
The American political system and the American electorate absolutely prefer "moderation" and the "center" but it can be very difficult to pin down what that actually means. Today, I think we can argue that marriage equality is a centrist position, but it certainly wasn't 20 years ago, even 15 years ago.
Someone like Elizabeth Warren, who is pretty far left on both economic and social issues, would be a terrible spokesperson for the Democratic Party in this environment, which doesn't mean that Chuck Schumer would be the ideal one. The last Democrat who seemed to comfortably straddle both sides of this debate was Obama, and the Left came to hate him for that.