2026 Midterm Elections: Why Control of Congress Matters

The approaching midterms will determine who controls Congress during the next two years. Reuters’ October 19 analysis describes narrow Republican majorities as central to the contest over President Trump’s remaining agenda.

All 435 seats in the House of Representatives are contested in the regular election cycle. Representatives serve two-year terms, which is why voters choose their House member at every midterm and presidential election.

Senators serve six years, with their terms staggered. Roughly a third of the chamber faces election every two years. A Senate race therefore will not appear on every voter’s ballot simply because a midterm is taking place.

Congress writes proposed laws and scrutinizes federal spending. The Senate also decides whether to confirm presidential nominees for Cabinet posts and federal judges, including Supreme Court justices. These responsibilities give congressional elections consequences beyond campaign branding. USAGov’s explanation of checks and balances sets out the relationship: a president can veto legislation, while lawmakers have their own authority over nominations and other constitutional functions. Winning a chamber therefore changes who participates in those decisions and how an administration’s priorities move through government. The president remains in office after a midterm, but the lawmakers working with or challenging the administration may change considerably.

The national battle is made up of state and district contests. Check the candidates and offices listed by your election authority rather than assuming the same races appear everywhere. A national poll can set the political context without describing your particular ballot.