taipei mayor odds: Chiang 65.5%, Shen 34.7% as Post-Debate Polls Split

The taipei mayor odds on Polymarket favor the incumbent, but not by a landslide: KMT mayor Chiang Wan-an traded near 65.5% Yes and DPP legislator Puma Shen near 34.7% at about 06:06 UTC on November 11, with the vote on November 28. Shen has gained about 3.5 points in a week, while post-debate polls disagree wildly on who is ahead.

What actually happened

Taiwan holds its nine-in-one local elections on November 28, and Taipei is the marquee race. Chiang, the KMT incumbent, is seeking a second term. Shen, a DPP legislator, is the main challenger. The two met in their first televised debate on October 31, and three polls taken that same weekend told three different stories.

TVBS ran a phone poll on the afternoon of October 31 and found Chiang at 46% and Shen at 42%. TVBS says the gap has shrunk from 28 points in late May, when Chiang polled 58%, to 8 points in early October and 4 points now, with about 10% undecided. Viewers in that poll rated Shen's debate performance higher, 47% to 40%.

ETtoday's online member panel, fielded November 1-3 with 1,853 responses and a ±2.28% margin, put Chiang at 50.7% and Shen at 41.9%. It also found 55.2% satisfaction with Chiang's performance as mayor. A Taiwan Strategy and Policy Institute poll, run with AI-assisted phone calls on October 31 and November 1, flipped the picture: Shen 52.6%, Chiang 35.3%, with Shen leading in 11 of Taipei's 12 districts, according to the Taipei Times.

What Polymarket thinks

At about 06:06 UTC on November 11, the Polymarket event showed:

• Chiang Wan-an: ~65.5% Yes (bid 0.65 / ask 0.66), down about 2 points in a day and 3 in a week
• Puma Shen: ~34.7% Yes (bid 0.346 / ask 0.347), up about 1.3 points in a day and 3.5 in a week
• Kuo Hsi: under 0.1%

The rules say the market resolves to whoever becomes the next mayor as a result of this election, using a consensus of credible reporting, and falls back on official results from Taiwan's Central Election Commission if there is ambiguity. If no winner is known by June 30, 2027, it resolves to "Other." Interim or placeholder mayors do not count.

Roughly two-to-one for the incumbent, with the challenger slowly closing.

How to read the taipei mayor odds

The market is basically siding with the incumbent and the two polls that show him ahead, while pricing real upset risk. A 34.7% underdog wins about one time in three, which is far from a long shot.

The poll spread is the main trap. Taiwanese pollster Senge Polling compared the three surveys and noted the leading margins span 28.6 points, which reflects different methods rather than a sudden swing in voters. TVBS used human landline calls, ETtoday a closed online panel, and the institute a landline-plus-mobile AI phone survey. Senge says the published details cannot isolate a mode effect or prove a debate effect. In short, do not average them blindly.

Turnout is the other wild card. Shen himself told reporters that the numbers matter less than getting supporters to vote. ETtoday's panel found 88.3% saying they would "definitely" vote, a self-reported number that may well be optimistic.

Election markets have been sharp lately. U.S. favorites mostly won in the midterms, as we covered in polymarket midterms accuracy. Foreign races can be thinner and noisier, as our french presidential odds breakdown showed.

What to do as a reader

If you follow the taipei mayor odds, compare new polls by method, not just topline, and watch for any second debate or late scandal before November 28. When a new survey drops, check who ran it, how people were reached and how undecided voters were handled before you react to the headline number. A single outlier poll can swing a thin book for an hour and then fade.

Read the resolution rules, keep position sizes small and do not treat a 65% favorite as a lock. Nothing here is financial advice.