You mean who I’d like to see as VP? I think there is enough chance that the VP pick will be President sooner rather than later that I’d like someone smart with some real administrative experience. This is more important to me than either policy positions or potential demographic draw, since I think there is broad agreement among all the potentials on the existential issues (climate, reproductive rights) and because I think control of and recovery from the pandemic will be big for the next couple of years.
Warren and Harris are both smart and both have solid administrative experience. I don’t see any advantage of Klobuchar over Harris, either in experience or in demographic appeal. Likewise Catherine Cortez Masto and Gretchen Whitmer.
If it was my choice it would probably be Tammy Duckworth; she’s really quick-witted, and kind of local to me. (Though I’m not sure what kind of President she’d make, so not the most rational of choices.)