Six months from the midterms, new voter registration data from across the country shows the Republican Party contracting in more than a dozen states, with the steepest losses appearing in states that will determine control of the House and Senate.
And the clearest signals are coming from the battlegrounds.
Arizona, which Trump carried by more than five points in 2024, saw Republican registration fall 3.7% between April 2025 and April 2026. Alaska dropped 2.6%. Connecticut fell 4.2%. Rhode Island recorded the steepest decline at 6.7%. Taken together, the losses add up to something more than a regional blip.
What makes the registration data more significant is the broader environment it is landing in. A record 38 Republicans are retiring from their House seats this cycle, Trump is 25 points underwater in ABC-Washington Post polling at this stage of his term, and Democrats hold a 14-point enthusiasm advantage, the largest since 2006 when Democrats picked up 31 House seats and five Senate seats.
The most consequential races are in states where the combination of falling registration and competitive polling creates the most pressure.
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In Maine, Republican Senator Susan Collins is trailing Democrat Graham Platner by 7 points in recent polling, while Republican registration has fallen 0.5%. In Arizona, Governor Katie Hobbs leads Republican Andy Biggs by 10 points while the GOP voter base quietly contracts.
Further north, the warning lights are blinking there, too. In Alaska, Mary Peltola holds a polling lead over Republican Senator Dan Sullivan despite the state going for Trump in 2024.
Cook Political Report’s April analysis showed Democrats leading in 213 House races and Republicans in 205, with 17 toss-ups, 14 of which feature Republican incumbents. The toss-up math alone is enough to flip the House.
There is, however, one complication sitting over all of this. The registration picture is shifting in both directions at once.
More voters are choosing to register as independent or unaffiliated, which means Republican declines do not automatically convert to Democratic gains.
Even so, Democrats currently hold a 5.9-point lead on the generic congressional ballot, while a new Supreme Court ruling on the Voting Rights Act has triggered a fresh redistricting fight. Republicans could gain advantages in Louisiana and Florida, while Democrats pursue maps favorable to them in California and Virginia.
That said, the historical comparison is not encouraging for the party in power. Political observers note that Trump is currently tracking worse than George W. Bush was at the equivalent point in his second term, when Democrats picked up 31 House seats in 2006.
Featured image via Political Tribune Gallery
