Going with both OK-1 and OK-5 here:
John Sullivan (OK-1) Calling him "reluctant" makes no GD sense, but calling him "backbencher defined" makes perfect sense. The most press worthy thing this guy has ever done is go into rehab, which should say a lot about how relevant he is.
James Lankford (OK-5) An urban reluctant. Frankly, I've never heard of this guy despite living in the district he represents since he got into office. He's done nothing, NOTHING, note worthy, hasn't stepped on any toes, and the most noteworthy thing mentioned on his wikipedia page is "bible this, bible that. He is married to a woman and they have two girls." So yeah, big freaking deal.
Senator Tom Coburn: Definitely a lawmaker. Despite his ideological grandstanding in election years Coburn is actually one of the more pragmatic Oklahoma politicians (which isn't really saying much being from the same state as James Inhofe and Sally Kern). The man is in Washington to get results.
That isn't to say, however, that I love the guy and think he's great.
Senator James Inhofe: Assclown Advertiser. Words can't describe how much of a buttmonkey this guy is. I mean really, he would be better suited as one of the flying monkeys in the Wizard of Ozz than he would be at US Senator. I mean really, who the hell uses an exploded picture of their family as an argument for the Defense of Marriage Act? WHO THE HELL DOES THAT!?