If Harris is our nominee who do you feel would be the best vice president to win this?

[Shrek]

18. Nope

He is prevented only from being elected.

It's possible to become VP without going through an election.

https://slate.com/news-and-politics/2024/07/is-joe-biden-dropping-out-of-the-race-one-idea-fantasy-football.html

The return of Obama—still very popular and the de facto head of the Democratic Party—would generate enormous excitement among party leaders, donors, and the general population. Other Democrats, who might have run for the top slot at a brokered convention, would lay such plans aside. A Harris-Obama ticket would almost certainly defeat Trump.

This scenario would not be unconstitutional. The 22nd Amendment states, “No person shall be elected to the office of the President more than twice,” but it doesn’t forbid a former two-term president from running for vice president. True, as veep, Obama would be in a position to return to the Oval Office for a third term, should Harris die or resign. But this wouldn’t be a problem either. The amendment reads: “No person shall be elected to the office of the President more than twice.” (Italics added.) It does not forbid subsequent succession to the office.