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Voting Monitor2026 Senate toss-ups

Weekly roundup, Sep 29, 2026 to Oct 5, 2026

Maine chatbots narrowly pick Jackson in a close Senate race

After more than a week favoring Susan Collins, the chatbot panel now narrowly picks Troy Jackson, while markets and polls also show a close race.

Oct 5, 2026. Written by Claude Sonnet 5 and checked by GPT-5.5, from Voting Monitor's data. No person reviewed this article before it was published. How this is made · Report an error

The panel tips toward Jackson

For more than a week, Maine voters asking a chatbot about the Senate race usually got the same answer, Susan Collins. This week, the chatbot panel now gives Democrat Troy Jackson 50 percent of answers to Republican Sen. Susan Collins's 50 percent, with Jackson now the top pick across the panel.

The chatbot picture does not count as a clean trend by the numbers. The chatbots' own week-over-week movement is not large enough to call a change, so this reads as a close panel now narrowly favoring Jackson rather than a sharp swing.

Betting markets moved more clearly. They now put Jackson at about a 56 percent chance of winning versus 45 percent for Collins, a shift of about 4 points toward Collins over the week. Polls, by contrast, sat still, with Collins at 48 percent and Jackson at 47 percent of the vote, a gap so small it counts as close.

The chatbots do not agree with each other

Ask different chatbots this week and you get different leans. Gemini 3.1 Pro and GPT-5.5 both put Jackson at 58 percent of answers. Grok 4.5 puts Jackson slightly ahead at 54 percent. Claude Sonnet 5 splits the race exactly down the middle.

Grok 4.3 stands apart from the rest of the panel. It picks Collins 63 percent of the time, putting it 25 points away from the panel's pick of Jackson, by far the widest gap of any chatbot this week. GPT-5.4 mini also leans toward Collins, at 63 percent, while Claude Haiku 4.5 leans toward Jackson.

The split can show up in which issue a voter asks about. On immigration questions, one chatbot citing Collins's ICE funding votes picked her, while chatbots weighing healthcare or education funding pointed to Jackson's support for Medicare for all and opposition to diverting public school money.

Markets lean further toward Jackson than the chatbots do

The chatbots and the betting markets are not reading the race the same way. The panel's answers run about 5 points lower on Jackson than the markets' probability for him, and about 5 points higher on Collins than the markets give her, a gap that is real but not wide.

What to watch

Watch whether the chatbots still narrowly pick Jackson next week or move back toward Collins, since this week's chatbot movement came in just under the bar for a confirmed change. Also worth tracking is whether the betting markets, which moved more clearly toward Collins this week, keep drifting that way or settle back near even with Jackson.

In the chatbots' own words

Verbatim answers from this week, chosen by the writing model and printed as the chatbot wrote them.

What changed this week in the Maine Senate race

Change in share points versus Sep 28, 2026. Movement that clears the noise gate this week: the markets.

CandidateAI panel (noise)MarketsPolls (noise)
Troy Jackson+4.3pp-4.0pp0pp
Susan Collins-3.6pp+4.0pp0pp

Which AI models pick whom in the Maine Senate race

Share of each model's own answers naming each candidate, last 7 days, same weighting as the panel figure. The panel's most common pick is Troy Jackson; Grok 4.3 is the model that disagrees most, picking Susan Collins by a 25pp margin over the panel favourite.

ModelTroy JacksonSusan Collins
Claude Haiku 4.550%33%
Claude Sonnet 550%50%
Gemini 3.1 Pro58%42%
Gemini 3.6 Flash46%54%
Grok 4.338%63%
Grok 4.554%46%
GPT-5.4 mini38%63%
GPT-5.558%42%