Trump is 70, and you have to factor in that, he might not even serve out a first term, much less a second. That has to be figured in when choosing a VP. Do you want a RINO as a VP?
The VP has to be a Constitutional Conservative with a voting record we can check out.
Ernst is a McConnell tool. Better Pence for the job.
Your argument is moot if Clinton defeats Trump; I am for the VP that allows Trump to defeat Clinton. Trump has a serious deficit among women that can improve.