I love Mitt but I think he too sees the wisdom in going with Sarah this election cycle. If he wants he can always take her on in 2012. Mitt is a smart man and he will be a great asset and already has been to the McCain campaign. I think back stage there is a lot more political maneuvering going on than meets the eye for many of us. We may find Mitt has had a much larger input into the McCain campaign than we can imagine. Mitt and Rove and McCain and all the rest have aligned to beat the Dems in many different areanas. Just wait.
I actually do see Mitt Romney (along with other former GOP Presidential candidates and/or VP candidates) possibly taking a cabinet position in a McCain administration.