Indeed, but I am starting to think he's working a bit too hard. Whenever I've seen him do a live appearance lately, he's looked really tired. He was definitely not at his sharpest during the last debate.
I have never seen Mitt looking tired and I have seen him in person (Irvine CA) but it must be absolutely grueling out there on the stump and he never lets up. I think Mrs. Romney has to pace herself.