I've also never seen Warren or Sanders say they support Bloomberg's spending in Florida - or Biden for that matter
Huh?
I might be wrong, but has Biden said in an interview or something "Thanks Mike! Very cool." Like, I'm sure he's totally cool with Bloomberg spending on his behalf, but I don't remember him explicitly endorsing it. My point was less about Biden and more that I'm pretty sure Warren and Sanders are still opposed to billionaires dropping mad cash to support a candidate in an election, even if it's a candidate they support.