Congress faces Supreme Court rulings with control at stake

The Supreme Court has altered voting maps and campaign spending rules before November 3, with Republicans defending control of Congress.

Democrats require four additional seats in each congressional chamber to displace Republican majorities. A Democratic takeover of the House or Senate would put President Donald Trump's legislative program at risk and give his opponents a platform for congressional investigations.

George Mason University law professor Ilya Somin assesses the court's recent election decisions as a net advantage for Republicans. Those courtroom gains do not establish how voters will respond, and the justices have rejected several measures supported by Trump and his allies.

Congressional maps change between censuses

Redistricting ordinarily follows the census at the beginning of a decade, allowing states to adjust representation for population changes. This cycle's map revisions instead began after Trump encouraged Republican-controlled states last year to replace boundaries with alternatives offering his party better electoral prospects.

Texas moved first, and the justices permitted its revised boundaries. The court subsequently approved California's Democratic-favoring map but prevented Missouri from deploying its Republican-favoring replacement in September, leaving both parties with a mixed record in individual disputes.

An April ruling narrowed protections under the Voting Rights Act, legislation enacted in 1965 to combat racial discrimination in elections. The decision increased the obstacles to racial-discrimination challenges against district boundaries; Republican-controlled Southern states subsequently moved to eliminate districts containing large Black populations, whose voters generally favor Democrats.

The institutional backdrop includes a 2019 opinion written by Chief Justice John Roberts that placed partisan gerrymandering beyond federal courts' authority. Six conservatives now sit alongside three liberals on the court, and Justice Elena Kagan has criticized her conservative colleagues for declining to constrain partisan mapmaking.

Speaking this week at Catholic University's law school, Kagan linked that approach to deeper political divisions. "It is making what I think is unfortunately a too-polarized country even more so," she said.

Party spending gains new latitude

A separate June decision removed federal ceilings governing expenditures that parties coordinate with their candidates. Vice President JD Vance was among those who brought the challenge; Republican committees subsequently spent above the former thresholds by more than Democratic committees did.

This month, the justices also permitted an administration policy extending reduced television and radio advertising prices to political parties rather than candidates alone. Together, the decisions give party organizations greater latitude over coordinated campaign spending and access to cheaper broadcast advertising.

University of Illinois Chicago law professor Steve Schwinn describes the election rulings as favoring Republican priorities overall. That is an assessment of the legal environment, not evidence that the decisions will deliver enough seats to preserve the party's congressional majorities.

Mail ballots and potential disputes

Mail voting offers a counterweight to Republican legal successes. In June, the court upheld ballot grace periods despite Republican objections; in September, it refused to permit enforcement of a US Postal Service restriction affecting mailed ballots.

Somin expects further election litigation but says Supreme Court involvement is harder to assess because the justices have considerable discretion over their docket. If new disputes reach the court, its decision to hear them would determine whether another round of judicial intervention follows an election already shaped by rulings on representation, spending and voting procedures.