Here we go with the VP merry-go-round!
CIA Chief Petraeus is very likely a Pappa Bush type social issue-wise--a pro-war liberal. He was a major part of the Iraq War, approving of the action. That makes him "a pro-nation builder" and nation building with trillions of taxpayer money is outside the Constitution and probably illegal.
That he was a major cog in the Bush Administration won't endear him to Conservatives.
Drudge has a poll going. Petraeus is losing.
In any case, I think this is "a no-go".