Mark Dayton or Tom Wolf would be good picks... from the Rust Belt, reasonably progressive, can over perform in their home states. They're both getting old, though.
Beto would be great if we really want to gun for the Sun Belt and suburbs. He'd top out appeal to young people too, which is absolutely necessary. I'm not sold that Kamala can't do that on her own, though.
I'd say Sherrod Brown is perfect but I reaalllllllllllly don't want to give up his Senate seat.
Let's just say she has options.
Love, love, love Mark Dayton but he has serious health issues and would have no interest in being on a national ticket. Sadly, I'd be surprised if he made it another 2 years with his health concerns.