South Dakota Senate 2026

The money race

Campaign fundraising this cycle, with independent expenditures by outside groups for and against each candidate.

R★Mike RoundsIncumbent
$3.18M
+$486K for
IBrian Bengs
$782K

Bars: money raised by the campaign this cycle. Thin bars: outside spending by super PACs and other groups, for and against.

Money raised and outside spending by candidate
Candidate	Party	Raised	Outside support	Outside opposition	Small-dollar
Mike Rounds	R	$3,176,451	$485,848	$0	50%
Brian Bengs	I	$782,050	$0	$0	23%

$3.96M

Raised by candidates

$3.04M

Spent by candidates

$486K

Outside spending

2 spenders

Candidates

Candidate	Raised	Individuals	PACs	Small-dollar	In-state	Spent	Donors
Mike Rounds (R)	$3.18M	$1.33M	$1.38M	50%	10%	$2.31M	917
Brian Bengs (I)	$782K	$775K	$5K	23%	17%	$731K	552

Outside spending

Independent expenditures reported to the FEC (Schedule E). “Dark money in” is the total of grants the spender received from 501(c) nonprofits, as traced by Poliscope.

Spender	Target	Stance	Spent	Network	Dark money in
DEFEND AMERICAN JOBS C00836221	Mike Rounds	Support	$412K 2 filings	Crypto super PACs	—
SOUTH DAKOTA CONSERVATIVE PAC C00904797	Mike Rounds	Support	$74K 5 filings		—

Candidates

Mike Rounds

R★ Republican · Incumbent

Raised: $3.18M
Small-dollar: 50%
In-state: 10%
Outside for / against: $486K / $0

Backed by Andreessen & Horowitz Backed by Paul Singer Backed by Stephen Schwarzman Backed by AIPAC Backed by crypto super PACs Backed by the NRA Finance & investment money Tech industry money+3 more

Brian Bengs

I Independent

Raised: $782K
Small-dollar: 23%
In-state: 17%
Outside for / against: $0 / $0

Mostly out-of-state money

Source: Poliscope (poliscope.org), from FEC filings. Roster curated from FEC candidate registrations. Withdrawn and defeated primary candidates are not shown.