Claire Conner McCaskill (; born July 24, 1953) is the senior United States Senator from Missouri and a member of the Democratic Party. She defeated Republican incumbent Jim Talent in the 2006 U.S. Senate election, by a margin of 49.6% to 47.3%. She is the first woman elected to the U.S. Senate from Missouri in her own right. She became the state's senior U.S. Senator upon the retirement of Kit Bond in 2011.