Who funds South Dakota Conservative PAC?

Its biggest reported donors in the 2026 cycle were Denny Sanford ($200K), William Duhamel ($150K), Condorcet ($100K), Katharine Duhamel ($50K), Custom Management Services ($50K), out of $575K received from donors tracked here.

Which candidates did South Dakota Conservative PAC spend the most on in 2026?

against Brian Bengs (South Dakota Senate, $985K, won); for Mike Rounds (South Dakota Senate, $154K, won).

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Outside spender

South Dakota Conservative PAC

FEC committee C00904797

Winner

South Dakota Conservative PAC spent $1.1M on independent expenditures in the 2026 federal elections, and 100% of it helped Republicans (FEC filings through Oct 14, 2026). Counting dollars, not candidates, and only races already called, 100% ended up on the winning side ($1.1M won, $0 lost).

Outside spending

$1.1M

On the winning side

100%

$1.1M

On the losing side

Supporting vs attacking

14% / 86%

$154K for, $985K against

Google says South Dakota Conservative PAC also spent $104K on Google and YouTube ads this cycle (9% of its FEC-reported outside spending). All ad buyers →

Follow the money

Who filled the envelope

South Dakota Conservative PAC reported $575K in gifts from people, companies, nonprofits and other PACs. The biggest are below.

All big donors →

Denny SanfordIndividual$200K (35%)
William DuhamelIndividual$150K (26%)
CondorcetCompany / nonprofit$100K (17%)
Katharine DuhamelIndividual$50K (9%)
Custom Management ServicesCompany / nonprofit$50K (9%)
Mark RowanIndividual$25K (4%)

Where the money went

Biggest targets, with whether each one paid off.

✓ Backed the winner or attacked the loser ✗ Backed the loser or attacked the winner Race not called yet Result not matched

Candidate	Race	Spending	Amount	Paid off?
Brian Bengs	South Dakota Senate	Attacking	$985K	✓ Yes
Mike Rounds	South Dakota Senate (primary)	Supporting	$154K	✓ Yes

Questions people ask

How much did South Dakota Conservative PAC spend in 2026, and did it win?: South Dakota Conservative PAC spent $1.1M on independent expenditures in the 2026 federal elections, and 100% of it helped Republicans (FEC filings through Oct 14, 2026). Counting dollars, not candidates, and only races already called, 100% ended up on the winning side ($1.1M won, $0 lost).
Who funds South Dakota Conservative PAC?: Its biggest reported donors in the 2026 cycle were Denny Sanford ($200K), William Duhamel ($150K), Condorcet ($100K), Katharine Duhamel ($50K), Custom Management Services ($50K), out of $575K received from donors tracked here.
Which candidates did South Dakota Conservative PAC spend the most on in 2026?: against Brian Bengs (South Dakota Senate, $985K, won); for Mike Rounds (South Dakota Senate, $154K, won).