Vote him out. If he votes to allow closure, vote him out.
Lucky, lucky you. Senator Coburn is a man who practices his beliefs. He term limited himself to 3 rounds in the House and 2 in the Senate. We Oklahomans grass rooted him in over strong GOPe opposition in 2004 and voted overwhelming to keep him in 2010. Since that means his seat will be vacant in 3 years, why don't you put yourself out there to take his place. Hmm?
Just because two good men have different views on how to proceed on an issue does not mean that one of them should be voted out over that one issue. Look at Dr Coburn's whole history in the US Senate before you judge him so quickly.
start here