Senator Tom Coburn, a Republican of Oklahoma, has been a conservative titan in Congress since his arrival in 1995. Throughout his career, Coburn has combated runaway spending -- at times running afoul of his own party's leadership -- while championing the pro-life cause (as a medical doctor, Coburn has delivered more than 4,000 babies over his career) and other conservative issues.
Nicknamed "Dr. No" for opposing a raft of legislation he'd determined to be unconstitutional, Coburn is perhaps best known for producing his annual "waste book" list of wasteful government spending.
He's also been an advocate for term limits -- a principle he'll live out by curtailing his current Senate term:
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