Having read the actual article on the T&D’s website, it looks like Sanford has been quoted out of context. All I would conclude is that he has said that is not a Presidential candidate, not that will not become one. It would be ludicrous for him to start a Presidential run befire he gets re-elected Governor in 2006, in any case.
I agree. It's considered tacky to expect the good folks of your state to pony up lots of cash for your re-election, just to bail on them two years later. Most politicians would prefer to get that re-elect 'W' in their column, then run anyway when it's time for the big show.
By the same token, Hillary won't formally announce until after she has won re-election to the Senate. Why give your opponent campaign ammunition when it isn't necessary?