I think Trump would have better luck beating Hillary than Biden/Warren. I hope she stays in the race.
Hillary is like fingernails on a chalk board. Plus there are so many other issues that can be to her detriment -- lies, health, Benghazi, varied scandals from finance to sex. With Biden/Warren you get Biden who's a good ol' aw-shucks kind of boy, a bit of a dolt, but likeable. Put that with Warren who attracts all the socialist nutbags. It could be a winning combo for the left. Hillary is poison; we'll keep her.