Sitting Vice Presidents traditionally do well in elections. Even Algore almost pulled it off.
I Needed that memory..../s
I hate to think about how many re re recounts a Joe Biden might demand regardless of the “point spread”
I'm not sure that being VP assures much of anything. George H. W. Bush won in 1988 but Nixon lost in 1960, Humphrey in 1968, Mondale in 1984 (as former VP) and Gore in 2000. Johnson won in 1964 and Ford lost in 1976 as former VPs who were elevated to POTUS and ran as incumbents.
Being VP gives a person visibility but doesn't seem like they do any better than would be expected from strong, experienced candidates.
When Bush 41 was elected, he remarked that it had been a long time since the last sitting VP, Martin Van Buren, had been elected president [in 1836].