Why will Dan Boren be one of the few House Blue Dog Democrats that gets re-elected?

Dan Boren is my Congressman and I wonder why even though it sounds like the Blue Dog Coalition is going to be almost eliminated this year why Dan Boren will be re-elected? Oklahoma is probably the most conservative state in the U.S. but yet in the second district of Oklahoma a Democrat that voted for the stimulus package will be easiliy re-elected. Why?