Maybe someone a bit better known, and maybe not a sitting Dem senator?

Biden/Harris works for me too. My family liked it too (all 6 Dems).

The Clinton 2016 States= 232 ev.
Harris wins all of the Clinton 2016 States plus MI,PA,and WI due to higher black voter turnout in Detroit-MI, Philadelphia-PA, and Milwaukee-WI.

Stacey Abrams.... (It's Our Dream, Okay)

Who Can Win:

Eric Swalwell - Love Him
Beto O' Rouke - If He Can Carry Texas This Time
Julian Castro - Yes!!!
Michael Bennet - Professor of Policy
Gary Peters - But, Darn It - We Would Hate To Lose Gary In Michigan
Doug Jones - IF and ONLY IF Democrats Can Retain The Alabama Seat in the Deep South
Sherrod Brown - Seal The Deal on Ohio

Swalwell comes from CA- same as Harris.
O'Rourke and Castro will be perfect VP runningmates to Harris if it wins them TX-38ev.
Sherrod Brown helps the 2020 Democratic Ticket win OH but Brown's OH US Senate seat will go Republican.
Michael Bennet is the perfect VP runningmate to Kamala Harris.
Bennet was born in New Dehli,India- his father served as an aide to the US Ambassador to India. Kamala Harris mother is from India. Bennet was an aide to OH Governor Richard Celeste from 1988-1990. Bennet can put OH in play and pick up PA,MI,and WI.
If Doug Jones runs for re-election to his AL US Senate seat- he is likely to lose unless the Republicans nominate another Roy Moore.

However, Michael Bennet seems like someone who can help Kamala in the Midwest. She needs that even though she should run strong in Michigan, Wisconsin and Penn -- a dent has to be put in Ohio and Michael Bennet (with the history you cited) might do just that.

If The Texas Route is Done with Castro or O'Rouke, Ohio would not be needed BUT -- Texas would have to flip for real this time. We are not so sure this still can be done with either possible candidate.

Keep Jones in Alabama. He will be running as a incumbent so he should have a 50/50 chance. Same with Sherrod Brown, keep him in Ohio -- as Ohio basically has lost its mind and he is the only piece of sanity left.

As for Eric Swalwell, National Security Advisor will work. He's a favorite of ours but the Duo California on the National Ticket does nothing to help us in other states outside of California.

We need Texas.