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Mike Rounds was born in Huron, South Dakota, and earned a degree from South Dakota State University. He built a career in the insurance industry and served in the South Dakota State Senate, rising to Senate Majority Leader, before being elected Governor of South Dakota in 2002 and serving two terms through 2011. Rounds was elected to the U.S. Senate in 2014 and has served since, bringing executive experience from his governorship to the chamber.

Rounds serves on the Senate Banking, Housing, and Urban Affairs Committee and the Senate Armed Services Committee, reflecting both his business background and South Dakota's significant military presence at Ellsworth Air Force Base. He has focused on agricultural policy, rural economic development, financial regulation, and defense issues throughout his Senate tenure. Rounds has also been active on issues related to cybersecurity and emerging technology, serving on relevant subcommittees and working on legislation to address evolving national security threats.

John Thune was born in Pierre, South Dakota, and earned a degree from Biola University and an MBA from the University of South Dakota. He worked as a lobbyist and served as executive director of the South Dakota Municipal League before being elected to the U.S. House of Representatives in 1996. Thune served three House terms and then made two Senate runs, winning in 2004 by defeating Senate Minority Leader Tom Daschle — one of the most significant Senate upsets in recent history — and has been re-elected since.

Thune has served as Senate Majority Whip, Senate Majority Leader, and Senate Minority Leader over his career, becoming one of the most powerful figures in Republican Senate leadership. He chairs the Senate Commerce, Science, and Transportation Committee in addition to his leadership responsibilities. Throughout his tenure Thune has focused on agricultural policy, rural telecommunications, and the economic concerns of South Dakota's farming and ranching communities, while also being a leading voice on fiscal restraint and tax policy.

Dusty Johnson was born in Pierre, South Dakota, and earned a degree from South Dakota State University and a master's degree in political science from the University of South Dakota. He worked as a political consultant and served as chief of staff to Governor Mike Rounds before being appointed to serve on the South Dakota Public Utilities Commission, where he became chair. Johnson was elected to the U.S. House of Representatives in 2018, representing South Dakota's single at-large congressional district, and has been re-elected since.

Johnson serves on the House Transportation and Infrastructure Committee and the House Agriculture Committee, both of which are central to the concerns of South Dakota's economy built on farming, ranching, and rural infrastructure. He chairs the Main Street Caucus, a group of moderate House Republicans focused on pragmatic solutions over ideological purity, and has developed a reputation as a dealmaker willing to work across the aisle. Johnson has focused on commodity programs, rural broadband, transportation funding, and protecting the interests of South Dakota's agricultural producers and small communities.