The Supreme Court’s membership is decided by two actors: presidents who nominate and Senates that confirm. Midterms only elect the second — but as the last decade proved repeatedly, the second is where the real power lives.
Confirmation math is majority math
Since the nuclear-option changes of 2013 and 2017 (explained here), every federal judicial nominee — district, circuit, and Supreme Court — needs only a simple Senate majority. There is no filibuster backstop. Whoever holds 51 seats controls the pipeline completely: a friendly Senate can confirm a justice in weeks, while a hostile one can simply decline to act, as 2016 demonstrated when a Republican Senate held a vacancy open for nearly a year rather than consider Merrick Garland. A midterm that flips the Senate does not just slow the president’s judicial project; it can freeze it entirely for two years — lower courts included.
Actuarial politics
Any vacancy in the next two years lands in whatever Senate November produces. Court-watchers game out retirement timing with the cold logic of an insurance actuary: justices increasingly time their departures for aligned government, and unexpected vacancies — the kind that reshaped the Court in 2016 and 2020 — obey no schedule at all. The 2026 result therefore sets the terms for every vacancy scenario through January 2029.
The restructuring agenda goes mainstream
The bigger shift this cycle is that structural Court change moved from law-review hypothetical to caucus position. Following the Court’s decision narrowing the Voting Rights Act, the chairs of the House Black, Hispanic, and Progressive caucuses introduced a resolution calling for expanding the Supreme Court, imposing term limits, and binding the justices to an ethics code — paired, tellingly, with eliminating the Senate filibuster, because none of it can pass a 60-vote Senate. That pairing is the tell: Court restructuring and filibuster elimination are now a single package in progressive politics, each required for the other.
Court expansion is constitutional — the number nine is set by statute, not the Constitution, and Congress changed the Court’s size seven times before settling there in 1869. The cautionary tale is 1937, when Franklin Roosevelt, fresh off a landslide, proposed adding justices and was routed by his own party amid a backlash that helped cost Democrats dearly in the 1938 midterms. Every modern expansion argument is conducted in that episode’s shadow — advocates insist this time the Court has spent its legitimacy first; skeptics answer that the retaliation cycle (each new majority adding justices) ends with no Court worth having.
What November actually decides
Realistically, no restructuring bill becomes law in the next Congress — the votes are not close. What 2026 decides is narrower and still enormous: whether the president’s judicial pipeline keeps flowing or freezes, which party is positioned for the next vacancy, and whether the restructuring caucus grows large enough that a future unified government treats expansion as a live option rather than a slogan. Court politics moves slowly, then all at once. The midterms set the board for the all-at-once.