What's with the reticence about Rob Portman? Lately here I've seen a few negative comments about him that I just don't understand.
That said, I don't think there is a clear choice for VP. My feeling is that folks will turn away from a disaster, but a safe/logical choice doesn't bring much. Remember, this is ultimately just the Veep slot, not the CinC. Romney needs to expend more energy promoting his 'repeal and replace' options for jobs/economy/healthcare than filling this position.