Mark Steven Kirk (born September 15, 1959) is an American retired politician and attorney who served as a United States senator from Illinois from 2010 to 2017, and as the United States representative for Illinois's 10th congressional district from 2001 to 2010. A member of the Republican Party, Kirk describes himself as socially liberal and fiscally conservative. As of 2025, he is the last Republican to represent Illinois in the U.S. Senate. Wikipedia
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