Used to be that geographical balance was more important. But bush had Cheney and both were from mountain time zone ( I think).
Now, I don’t think the vp choice is terribly important unless you pick someone with lots of negatives (palin).
I think mccain would have won if he picked someone from Florida and I think the same is true with al gore.
Texas is Central Time Zone.
I agree that VP pick is not very important, though Palin might have impacted the election.