Polymarket prices Democrats at 70% to sweep Congress

Polymarket traders have priced Democrats' chances of winning both the House and Senate at 70%, a new high, ahead of Tuesday's midterm elections. The figure reflects a surge in the platform's implied probability for a Democratic sweep of Congress.

A 70% sweep probability this close to Election Day is a high-confidence signal that political traders are pricing in; it will be tested against actual results and shape post-election narratives about prediction market accuracy.