He talks a little to "LA", as well. Certainly doesn't sound like someone who was raised in east KY. But, I'm a fan of Olyphant from his days on Deadwood, so I'll give him a pass.
They have been playing his movies on FX; he was the bad guy in that last Die Hard movie, and Hitman. Looking at IMDB, looks like his career is starting to take off. I think I can catch Deadwood on one of the Directv channels, not HBO.