Paul Waldman of the Washington Post chalks it up to sexism, although it’s possible that there was not enough space for two progressives in the race. I met Senator Warren about five years ago and we spent half an hour talking. She listened, which is rare. I thought she was the smartest elected official I had ever met.

He writes:

Is it enough, as a presidential candidate, to have smarts and charisma, to have a clear and concise message, to even be the best debater, and most of all to be the best prepared to do the job effectively?

No, it is not. Which is why so often during this primary campaign, we’ve heard supporters of Elizabeth Warren ask plaintively, “Hey, what if we got behind the person who’d actually be the best president? Why not do that?”

They asked because the number of voters willing to do that was not what it might have been, which is why Warren has announced that she’s ending her bid for the White House.

There is a temptation to say the presidential primary process is brutal and unsparing but ultimately fair. It tests you in the way no other campaign can. If you don’t win, it’s because you didn’t have what it takes. Lots of it may be out of your control, but if you were a once-in-a-generation talent like Bill Clinton or Barack Obama, you could have overcome any obstacle cast before you. Nobody deserves the nomination; either you win it or you don’t.

Which is true as far as it goes. But we can’t consider Warren’s candidacy without seeing sexism, both in fact and in perception, for the hindrance it was for her.

To be clear, sexism isn’t the only reason Warren will not be the Democratic nominee. There are many reasons. She had a few stumbles along the way, as every campaign does. There were some decisions she could have made differently.

But her campaign and the particular way it failed tell us a lot about how gender operates in presidential politics.

Let’s consider that Joe Biden is the likeliest candidate to be the Democratic nominee, despite the fact that he has run an absolutely abysmal campaign and is so erratic that sympathetic Democrats regularly tell one another, “I saw Biden give an interview, and he was completely coherent!” as though they were praising a toddler. Biden won a sweeping victory on Super Tuesday even in states where he did not campaign for a single day or have an organization. There has never in my lifetime been a winning presidential campaign that was so weak on so many dimensions.

And yet Biden is cruising toward the nomination. Why?

Because of a collective decision among a significant portion of the Democratic electorate that he is “electable,” i.e., that other people will find him inoffensive enough to vote for. As Michelle Cottle noted, one poll last year asked Democrats who they were supporting, and Biden was in the lead; when they asked who they’d rather see as president if they could wave a magic wand, Warren was in front.

You’ve probably heard that again and again: Voters saying Warren is the one they liked the best, but because they didn’t think she was electable, they were supporting someone else, most often Biden.

That perception didn’t just come of nowhere. Yes, people might be thinking of their sexist uncle or their “traditional” parents, but they also heard it again and again from the media, creating a self-reinforcing loop.

Sure, Warren can put policy issues into terms people can understand like no other candidate; sure, she has thought more seriously about the powers of the government than anyone else; sure, her anti-corruption message resonates with all kinds of voters. But she just can’t win.

Then there are all the people who said they didn’t like Warren but couldn’t quite put their finger on why. Maybe it was her voice, or that she seemed too aggressive, or that she wasn’t “authentic” enough. Not because she’s a woman, though! I’d support a woman, I would! Just not her.

He has more to say about why Warren didn’t make it. But the point is clear. This country may someday elect a woman as president. But not yet.