Here's why Rice would be a bad pick.
1) She's not a politician. She's simply not ready for how savage that game can be.
2) She'll remind everyone about Bush. That's the last thing Romney needs.
3) She'll remind Republicans how really unimpressed they are with Romney and how the establishment bullied them into a candidate most of them really didn't want. "Oh, my God. I have a pulse!"
The fact is, the Veep hasn't been a game changer since 1960, and it won't be this time.
Romney would be better off picking Portman or Pawlenty. Dull, competent, know how to play the game, won't upstage the boss.