Democratic Primaries

Of a total 3,979 delegates, 1,770 have been allocated thus far, leaving 2,209 remaining. Bernie's down by 154 delegates right now, and the momentum is all going Biden's way. Polls indicate that future primaries are likely to be a bloodbath for Bernie, but polls aren't perfect predictors of how things will go. And not all that long ago, Bernie had the momentum. So no, I don't think Bernie is mathematically eliminated, not yet.

As a practical matter, Bernie's almost certainly done. Like I said, I can respect hanging in until Biden hits the magic number. Hanging in a moment longer than that, though, is just being foolishly stubborn. Do I think what Bernie's doing is great? No. Do I think he's deliberately helping Trump out of spite? Also no.