At last, the speculation of a Sanders run has finally gone downhill. That's wonderful until you realize that speculation of a Warren run is going up.
If they nominate Steve Bullock, Democrats will lose once again. It would really say something about the USA, if the most left-wing party that is relevant nominate a candidate which is more right-wing than our most right-wing political party. I would really hope Democrats would lose again, just like they've did with Hillary. Some moderate republicans and independents might shift to Republicans yes, but some Democrats that want change, will back Trump or even more likely don't turn out. No doubt about that, and you'll lose the Rust Belt once again.