A good VP pick -- people are talking about Marco Rubio right now -- could attract people who are on the fence.
Of course the candidate at the top of the ticket would have to be smart enough know this (and be confident enough not to be threatened by the popularity of the VP pick).
I hate to say it, but it will probably be Romney/Rubio. I’m happy with half of that ticket.
Rubio is NOT a natural born citizen. Therefor is NOT qualified for the office.