William Todd Tiahrt is an American politician who served as the U.S. representative for Kansas's 4th congressional district from 1995 to 2011. A member of the Republican Party, he was elected as part of the historic Republican Wave of 1994, defeating 18-year incumbent U.S. Representative Dan Glickman. He ran in 2010 for the United States Senate seat being vacated by Sam Brownback. He lost to fellow Republican U.S. Representative Jerry Moran of Hays, Kansas, 50%–45%.

Vermillion is a city and the county seat of Clay County. It is in the southeastern corner of South Dakota, United States, and is the state's 12th-most populous city. According to the 2020 Census, the population was 11,695. The city lies atop a bluff near the Missouri River.