Democrats lead Republicans 44% to 39% according to the latest survey from YouGov. The remainder was split between undecided, other, and non-voters.

The stakes are high because every House seat and a slate of Senate seats are on the ballot when the midterms are held in November 2026, with voters deciding who runs committees, writes the calendar, and sets spending priorities. The polling from YouGov indicates that the Democrats could gain control of the House and Senate.

If Republicans lose Congress, President Donald Trump would face a hostile legislature and enter an effective lame-duck phase that constrains appointments, budgets, and lawmaking. That dynamic would likely weaken Vice President JD Vance’s prospects of succeeding him, since party momentum, fundraising, and policy delivery would all be harder to sustain without congressional control.