Conversation so far:
What was Tom Coburn's senate career?
After three years out of politics, Coburn announced his candidacy for the Senate seat being vacated by four-term incumbent Republican Don Nickles.
Did Tom Coburn win the position of Oklahoma senator?
Yes, Tom Coburn won the position of senator against Brad Carson by a margin of fifty-three percent.

Question: What did he do once he won?
Self-contained rewrite: What did Tom Coburn do after he won the position of Oklahoma senator?