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South Dakota Auditor

Auditor · South Dakota

Catherine Barranco held the seat for Republicans, winning by 25.1 points over Tom Cool.

Catherine BarrancoRepublican · winner
62.5%182,694
Tom CoolDemocrat
37.5%109,392
292,086 votes

Source: South Dakota Secretary of State unofficial resultsUpdated Nov 7, 2026, 1:22 PM ET

Where the race moved

Against the 2024 presidential vote

Every county, 2024 to 2026

Each dot is a county, sized by votes cast and colored by who carried it in 2026. Dots above the line moved toward Cool compared with the 2024 presidential vote; 53 of 65 did. The largest shift among the bigger counties: Charles Mix, +13.4 points.

R+90R+90R+45R+45EvenEvenD+45D+45D+90D+90Moved toward Democrats ↑↓ Moved toward RepublicansMinnehahaPenningtonLincolnBrownBrookingsLawrence2024 presidential margin →2026 margin →

Source: civicAPI county results (unofficial); 2024 president: MEDSL precinct returnsUpdated Nov 7, 2026, 1:34 PM ET

The seat's recent races

EvenR+28.02018 RaceR+30.82022 RaceR+29.92024 Pres.R+25.12026 Race

Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)

By county

CountyShareMarginShift
MinnehahaR+6.7+5.9
PenningtonR+22.8+3.7
LincolnR+22.4+4.1
BrownR+23.1+3.8
BrookingsR+16.9+0.5
LawrenceR+29.6+1.8
MeadeR+48.1+2.8
CodingtonR+35.6+5.2
Show 57 more
YanktonR+18.0+7.6
HughesR+35.8−5.7
DavisonR+32.5+5.3
UnionR+34.8+5.9
BeadleR+35.4+4.7
CusterR+46.0−0.2
LakeR+30.1+1.0
ClayD+14.2+7.7
ButteR+59.6+1.0
Fall RiverR+48.4+0.9
TurnerR+47.1+4.2
RobertsR+14.5+8.5
GrantR+43.9+1.5
Charles MixR+29.5+13.4
HutchinsonR+54.3+3.6
MoodyR+23.7+8.2
SpinkR+38.1+0.9
HamlinR+56.1+4.3
DayR+25.7+4.2
McCookR+42.5+6.8
Bon HommeR+43.4+8.0
KingsburyR+39.7+4.1
TrippR+64.9−1.6
BruleR+36.4+6.0
ToddD+53.9+3.4
DeuelR+47.8+3.9
WalworthR+58.7+0.5
MarshallR+17.7+6.3
GregoryR+51.7+8.5
ClarkR+53.4−0.9
EdmundsR+57.3+3.5
StanleyR+45.6+1.2
DeweyD+20.3+7.5
HandR+58.7−1.4
DouglasR+77.3−4.9
PerkinsR+68.4+1.6
HansonR+52.6+6.7
LymanR+32.0+7.4
McPhersonR+73.9−4.7
AuroraR+39.7+14.5
PotterR+66.3−1.2
MinerR+39.6+7.4
BennettR+14.2+12.2
HaakonR+75.0+4.9
SanbornR+43.3+12.0
FaulkR+60.2+5.0
JacksonR+35.5−0.4
CorsonR+6.4+5.5
SullyR+64.3−3.5
JerauldR+42.5+0.7
HardingR+85.0+1.1
MelletteR+19.0+1.2
CampbellR+73.3−3.2
ZiebachD+2.8+5.6
HydeR+55.5−0.5
JonesR+74.2+1.6
BuffaloD+34.1+6.8

Bar: share of the state's vote. Shift: change in margin from the 2024 presidential vote, + toward Democrats.

Source: civicAPI county results (unofficial); 2024 president: MEDSL precinct returnsUpdated Nov 7, 2026, 1:34 PM ET

Pre-election forecast (final, Nov 3)

Our model's last run before Election Day, Nov 3, 2026. It no longer updates.

Tom Cool
<1%
Catherine Barranco
>99%
Projected margin
R+20.5
How the forecast works →

The candidates

Catherine Barranco (R)
Economist and political organizerTom Cool (D)
Journalist

Also on this ballot here

U.S. SenateR+21.0
GovernorR+27.0
Attorney GeneralUnopposed
Secretary of StateR+22.3
TreasurerR+24.9

Results within this state. Source: Results and race calls: South Dakota Secretary of State (unofficial)Updated Nov 7, 2026, 1:22 PM ET