We'll see, at least with regards to Trump. Usually a VP is selected to "round-out" the ticket, to bring in additional votes from those who iffy on on the presidential candidate. But if this guy is already MAGA to extreme and a Trump loyalist (though he wasn't always), what segment is that bringing in that wasn't already planning to vote for Trump?
In other words, how many Republicans are there who don't like Trump and wouldn't vote for him, but now that Vance is there, will vote for Trump? I feel like that's a pretty small number.