Horizon · our Election Day forecast: polls, plus fundamentals like incumbency, fundraising and past results.

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Arkansas › U.S. Senate · November 3, 2026 · Updated Oct 16, 2026

U.S. Senate in Arkansas

Cotton is very likely to win: Cotton wins in 19 of every 20 simulations.

Shoffner (D)
5%
chance of winning
Cotton (R)
95%
Average margin
R+13.1
80% of outcomes
R+23 to R+4
Partisan lean
R+31
Polls
5in our database

Cotton is clearly favored to win: Cotton wins in 19 of every 20 simulations.

Shoffner (D)
6%
chance of winning
Cotton (R)
94%
Average margin
R+13.1
80% of outcomes
R+24 to R+3
Partisan lean
R+31
Polls
5in our database

Range of outcomes

R+13.1R+30R+20R+10EvenD+10D+20D+30
R+13.1R+40R+20EvenD+20D+40

How the odds have moved

Chance of winning by forecast date.

0%25%50%75%100%AugSepOctNovNov 3Shoffner 5%Cotton 95%

Updated nightly. Each day is the current model run on the polls that had ended by then (how).

0%25%50%75%100%AugSepOctNovNov 3Shoffner 6%Cotton 94%

Updated nightly. Each day is the current model run on the polls that had ended by then (how).

The candidates

Democratic

Hallie Shoffner

Farmer and entrepreneur

Experience
No elected office
Raised
$3.7M
From individuals
$3.6M
Spent
$2.3M
Cash on hand
$1.4M

Money: FEC, through Sep 30, 2026.

Profile and career

RepublicanIncumbent

Tom Cotton

Incumbent U.S. senator (2015–present)

Experience
Statewide office or Congress
Raised
$7M
From individuals
$3.5M
Spent
$7.6M
Cash on hand
$6.8M

Money: FEC, through Sep 30, 2026.

Profile and career · Wikipedia

What goes into the forecast

Every ingredient's estimate of the final margin.

National environment
D+9.5Election Day forecast; federal races run in it
← RepublicanDemocratic →Lean + environmentUsual vote, shifted by the national and state moodR+20.7Fundamentals modelAdds incumbency, past results, money andexperienceR+23.3Polls in similar placesPolling of similar races in Arkansas andlook-alike placesR+23.1Polling average5 polls, latest Oct 4R+8.8Horizon forecastPolls + fundamentals, projected to Election DayR+13.2Pulse forecastPolls (and polling of similar places) only, todayR+13.2

Each estimate is a margin before national and statewide uncertainty is simulated. Horizon blends polls, fundamentals and a little of the similar-places estimate, weighting each by how precise it is; Pulse uses polls and similar places only.

Fundamentals inputs
Incumbency (+1 D, −1 R)-1
Fundraising edge (log ratio of individual money)0.91
Elected-experience edge-1
First-term incumbent0
Seat's last result vs. expectation-30
Incumbent's last result vs. expectation-32.88

Polls

R+20R+10EvenD+10D+20Avg. R+8.8Feb 9Nov 3
All 5 polls
PollsterDatesSampleShoffnerCottonMarginAdjusted
GrayHouseR-sponsoredSep 30–Oct 4550 LV3950R+11R+8.7
J.L. PartnersAug 14–Aug 18803 LV3551R+16R+14.7
Hendrix College for Talk Business & PoliticsAug 11–Aug 121,217 LV4744D+3D+1.4
2040 Strategy Group for Shoffner's campaignD-sponsoredJul 17–Jul 25586 LV4346R+3R+7.7
GrayHouse for America One PoliciesR-sponsoredFeb 7–Feb 9550 LV3658R+22R+14.0

Adjusted: after correcting for the pollster's house effect, registered vs. likely voters, and movement in the national environment since the poll; shown for the polls carrying the most weight in today's average. Larger dots in the chart carry the most weight. Last poll: Oct 4, 2026.

The state

Lean R+31: how much more Democratic or Republican than the nation it votes for president.

Presidential vote

← RepublicanDemocratic →2016 presidentR+28.6R+30.8 vs. nation2020 presidentR+28.4R+33.0 vs. nation2024 presidentR+31.3R+29.8 vs. nation

Who lives here

Population
3,049,391
Adults with a B.A.+
26%
White, no degree
52%of adults
  • White 67%
  • Hispanic 9%
  • Black 15%
  • Asian 2%
  • Other / multiracial 7%

American Community Survey 2020–2024, aggregated from census tracts.

Past results

2024 President Vote in this state

1,156,146 two-party votes · R+31.3 · R+29.8 vs. the nation
✓ Donald Trump (R)65.7%
Kamala Harris (D)34.3%

2020

1,193,261 votes · Uncontested by the other party
✓ Tom Cotton (R)66.5%
Ricky Dale Harrington Jr. (L)33.5%

2020 President Vote in this state

1,184,579 two-party votes · R+28.4 · R+33.0 vs. the nation
✓ Donald Trump (R)64.2%
Joe Biden (D)35.8%

2016 President Vote in this state

1,065,366 two-party votes · R+28.6 · R+30.8 vs. the nation
✓ Donald Trump (R)64.3%
Hillary Clinton (D)35.7%

2014

847,000 votes · R+17.8
✓ Tom Cotton (R)56.5%
Mark L. Pryor (D)39.5%
Nathan Lafrance (L)2.0%
Mark H. Swaney (G)2.0%

2008

1,011,754 votes · Uncontested by the other party
✓ Mark L. Pryor (D)79.5%
Rebekah Kennedy (G)20.5%

2002

804,121 votes · D+7.8
✓ Mark Pryor (D)53.9%
Tim Hutchinson (R)46.1%