Whitmer and Newsom would be leading a handful of D candidates still in until Super Tuesday.
The GOP nominess by unanimous acclaim would, of course, be Donald Trump.
Whitmer probably wouldn't even get 3% in IA and drop out (assuming IA would still go first, but she'd arguably do worse in SC or GA if that came first). Same for Newsom, zero appeal to areas other than the west coast. Maybe, they are the forum favourite darlings but we have no data on whether the Democratic Party would favour these candidates if Biden wasn't running.