2026 Midterms: What’s Old in Washington

The 2026 election map makes a Democratic House takeover likely but leaves Republicans favored to retain the Senate.

• CFM's Senate model uses presidential results, presidential approval, incumbency and state polling, and simulates the nine competitive races 50,000 times; Democrats win a majority in about 40% of runs, with a plausible range of 20% to 45% depending on how correlated polling errors are.
• Democrats need to gain 4 Senate seats from a starting point of 47, meaning they must win roughly 7 of 9 competitive races; Michigan is nearly indispensable, while winning both North Carolina and Maine would give them a 63% chance of control.
• The Senate model correctly calls the winner in about 84% of competitive-seat backtests, showing that presidential lean and the national environment determine most outcomes before the campaign.
• The House model estimates a median Democratic delegation of 234 seats, with a 90% range of 210 to 243 and an 85% probability of Democratic control; a roughly 9-point national swing against Democrats would reduce the race to a coin flip.
• Mid-cycle redistricting across 10 states shifted approximately five net seats toward Republicans: Florida's Democratic-leaning districts fell from eight to four, while Texas redrew 37 of 38 districts despite a statewide Democratic vote share near 44%.

Takeaway: Investors should distinguish the high-confidence Democratic House scenario from the much more constrained Senate path, where Michigan, Maine and North Carolina matter disproportionately and polling-error assumptions materially change the odds.