I think he should. “He lost the senate race” is an argument, not a disqualifier. He’s got a charisma that would excite people and bring young voters out. He’s got a way of garnering media attention that would put him in top tier. He generally defies being pegged as in one Dem wing or the other better than Sanders or Warren, he comes across as way more populist than Harris or Booker. I think I’d prefer him over 3 of them, still listening to Harris.
What’s the worst that could happen? I’d think losing the Dem Primary would be less political-career ending than losing a second Senate bid (against Cornyn).
This is pretty much how I feel about the issue. If he loses his senate run but is still able to keep up positive buzz about himself, I think he could have a good amount of momentum going into the primaries.