Which of these hypothetical Democratic tickets would perform better in 2020?

[dw93]

Assuming Biden and Bernie don't run due to age, which one of these possible tickets would perform better against Trump/Pence?

Klobuchar/Bullock would probably have the most appeal to the general public, Harris/Brown and Warren/Castro are probably the most balanced (these two tickets have one person from the Bernie wing on the ticket and the other from the Hillary wing), so they'd probably excite the base the most (outside of the staunchest Bernie supporters and biggest affluent Latte sipping social liberals on the coasts). 2020 would be too soon for Newsom,  Gillibrand/Patrick could be problematic IMHO, and any ticket with Cory Booker risks going down in defeat. I guess I'd rank them:

Klobuchar/Bullock (tie)
Harris/Brown (tie)
Warren/Castro (tie)
Gillibrand/Patrick
Newsom/Ryan
Booker/Cortez-Masto

[dw93]

Assuming Biden and Bernie don't run due to age, which one of these possible tickets would perform better against Trump/Pence?

Klobuchar/Bullock would probably have the most appeal to the general public, Harris/Brown and Warren/Castro are probably the most balanced (these two tickets have one person from the Bernie wing on the ticket and the other from the Hillary wing), so they'd probably excite the base the most (outside of the staunchest Bernie supporters and biggest affluent Latte sipping social liberals on the coasts). 2020 would be too soon for Newsom,  Gillibrand/Patrick could be problematic IMHO, and any ticket with Cory Booker risks going down in defeat. I guess I'd rank them:

Klobuchar/Bullock (tie)
Harris/Brown (tie)
Warren/Castro (tie)
Gillibrand/Patrick
Newsom/Ryan
Booker/Cortez-Masto

Wait why would Gillibrand/Patrick be problematic?

I think it would be because there's no regional balance or much ideological balance (if any). No regional or ideological balance was something that could be done in 1992, it's not something the Dems can do in 2020. I think it would drive down turnout among Democrats for some of the same reasons Clinton/Kaine did.