Polymarket prices 67% odds of Democratic congressional sweep October 29

Split and Republican sweep outcomes trail sharply in prediction market pricing as of the October 29 reading.

Priya Anand

Markets Analyst

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Stands on 11 placed sources from 6 publishers.

As of 2026-10-30 04:56 UTC. Market figures are as the cited sources reported them at that time and may have moved since. This is news, not investment advice.

Polymarket prediction markets priced a 67% chance of a Democratic sweep of both US congressional chambers as of 29 October 2026^[1].