South Dakota Republican Sen. John Thune has the largest political war chest of any U.S. senator, topping the $20 million mark even though he’s not up for re-election until 2028.
Rep. Dusty Johnson, the state’s lone congressman, ranks 18th in the U.S. House of Representatives with nearly $5 million, despite being heavily favored in his 2024 race against Democratic challenger Sheryl Johnson.
These fundraising efforts reveal ambitions beyond the Nov. 5 election, as Thune pursues the job of Republican Senate leader in Washington and Johnson positions himself to run for South Dakota governor in 2026.
There will also be a U.S. Senate election that year because Sen. Mike Rounds’ term is up, and Johnson’s exit would open the U.S. House seat. That makes 2026 potentially one of the most contested and consequential cycles in recent state history.
The best way to chart the ambitions of those seeking office is to follow the money.
News Watch used Federal Elections Commission data to rank the top five political war chests in South Dakota as of the last reporting date, June 30. The rankings encompass cash-in-hand amounts from principal campaign committees and federal and state political action committees (PACs).
Campaign committees are authorized by a candidate to accept contributions and make expenditures on behalf of a political campaign. Leadership PACs are used by federal officeholders to support candidates within their political party.
The rankings do not include super PACs, which are free from the donation limits of campaign committees and standard PACs but cannot be used to directly benefit individual political campaigns.
News Watch spoke to candidates, political consultants and campaign finance experts to get a sense of what’s happening behind the scenes as South Dakota officeholders envision their future beyond this November.
Below are the top five and what their fundraising says about their next moves.
Sen. John Thune
Fundraising sources:
Friends of John Thune (campaign committee): $18,518,498
Thune, the No. 2 Republican in the Senate, is focused on succeeding Mitch McConnell as GOP Senate leader, which would represent one of the highest political levels achieved by a South Dakotan.
Former Democratic Sen. Tom Daschle served as both minority leader and majority leader before being ousted from the Senate by Thune in a landmark 2004 election.
“Members of leadership have dual motivation to advance their party and raise their own status within the party,” said researcher Andrew Mayersohn of Open Secrets, a government transparency group that tracks money in politics. “They have two good reasons to raise massive sums of money, more than what an ordinary senator might raise.”
As McConnell’s right-hand man as minority whip, Thune is well-positioned to win the job over fellow contenders Sens. John Cornyn of Texas and Rick Scott of Florida. The next leader will be chosen by secret ballot among the caucus of Republican senators on Nov. 13, the week after the election.
The ability to raise money for fellow Republicans as the party seeks to regain control of the Senate is a prerequisite for the leadership position, and Thune has been active in that regard.