I don't think it's any of these. I think Mitt leaked this list to get the MSM talking and he will pick someone off this list in hopes of creating a surprise. Mitt needs to energize his base and none of these three are going to do that.
"Speculation over who will join Mitt Romney on the GOP ticket continued Tuesday, one day after a since-denied report that the presumptive nominee had already made up his mind.
The latest reading of the tea leaves comes from Reuters, who reports that it appears to be a three-man race among Ohio Sen. Rob Portman, former Minnesota Gov. Tim Pawlenty, and Louisiana Gov. Bobby Jindal-three men widely considered to be 'safe' choices in the post-Palin world."
http://slatest.slate.com/posts/2012/07/16/romney_will_announce_vice_presidential_selection_soon_friends_reportedly_say.html
'There are three sides to every story. My side, your side, and the truth. And no one is lying. Memories shared serve each one differently'
-Robert Evans-