During a campaign, a VP candidate serves only one purpose. Gain votes. And DEFINITELY don’t lose votes. Thats it. What additional votes does JD Vance bring in? What centrist is going to look at JD Vance and think “well i think that guy moderates Trump a bit so I’ll take a chance and vote GOP”. None. Tulsi Gabbard would have brought in some suburban women. Doug whats-his-face from ND wouldn’t have brought anyone else in, but he wouldn’t have cost Trump any votes. Vance is super smart but runs his mouth enough to alienate at least a few potential voters.
Lol.
Vance is such a minor footnote in this race that most voters will not even know his name.
Quiz:
Who is Hannibal Hamlin? (no cheating allowed)
So that being ready to assume the Presidency idea doesn’t really matter?