This is pretty close to my thoughts on Oklahoma save for McCain's low performance. I'm shocked, in a good way, that he's barely polling a majority. I would put him, and still do, at 57-59%. I still think Obama can get 40% in Oklahoma, but that is his ceiling. You're right, Bush was perfect for Oklahoma, but McCain is looked on with much less respect than President Bush. Obama, on the other hand, is just like Kerry in Oklahoman's eyes, but he is a much more dynamic and eloquent speaker that he polls a little higher based on that fact coupled with the less-than-stellar John McCain.
What's not really shocking, however, is Inhofe trouncing Rice. Note: That's a change from my previous thought, until, much to my shigrin, I remembered that Rice got trounced by Inhofe in 2002.