OKLAHOMA CITY—Former U.S. Sen. Tom Coburn, an Oklahoma family doctor who earned a reputation as a conservative political maverick as he railed against federal earmarks and subsidies for the rich, has died. He was 72.

Mr. Coburn, who also delivered more than 4,000 babies while an obstetrician in Muskogee, where he treated patients for free while in the Senate, died early Saturday morning, his cousin Bob Coburn told The Associated Press. Tom Coburn had been diagnosed years earlier with prostate cancer.

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