A comment from Jay posted on mymanmitt:
One other thing... I think we Mitt fans ought to take the approach of: "Anything _____ can do, Mitt can do better." Brownback might have a decent (if blemished) record on fiscal restraint - But Romney has a better one. Giuliani may have a lot of charisma - But Romney has more. McCain may talk straight, but Romney talks straighter, more forcefully, and with greater clarity and precision.