Supreme Court deadlines threaten midterm voting choices

In the run-up to the November 3 midterms, the Supreme Court is weighing two election-related cases that could tighten how votes are counted and reshape political spending. A Mississippi dispute over whether late-arriving, postmarked-by-Election-Day mail ballot

By the time many ballots are in the mail. Election Day is already behind voters—especially those who vote from far from home. That timeline is at the center of a Supreme Court fight out of Mississippi that could change what happens to mail votes after the polls close. just weeks before the November 3 midterm elections.

The case, brought by Republican Party officials, asks the court to strike down Mississippi state laws that allow late-arriving mail ballots to be counted as long as they are postmarked by Election Day. The Supreme Court is expected to rule by around the end of June.

Trump has also pushed publicly to cast doubt on the security of mail-in ballots, even as evidence of voter fraud has been rare. In practice, Democratic voters tend to use mail voting more than Republicans, raising the stakes of any rule that affects when ballots must arrive.

This is not happening in a vacuum. The Supreme Court’s conservatives are already reshaping the electoral landscape this year with a 6-3 majority. In April. in a case from Louisiana. the court gutted a key provision of the Voting Rights Act—making it harder to challenge electoral maps as racially discriminatory. Legal experts said the fallout from that decision has been immediate.

The Voting Rights Act ruling opened the door for Republican state legislators to dismantle Democratic-held U.S. House districts with large Black or Latino populations across the South, potentially giving Republicans an electoral advantage for years. Black and Hispanic voters tend to vote for Democratic candidates. As a result, Republicans were positioned heading into the November midterms to gain up to a dozen U.S. House seats currently held by Democrats through redistricting—the redrawing of district boundaries.

But the new cases expected by late June could strike closer to the act of voting itself.

Mississippi’s law. at the heart of the mail-in ballots “grace period” dispute. permits mail-in ballots to be counted if they are postmarked by. and then received within five business days of. Election Day. The legal fight turns on whether federal laws setting dates for federal elections preempt state laws that let ballots be received after Election Day.

During March arguments, a majority of the justices appeared ready to invalidate Mississippi’s law. But the court faces a tightrope: even if the justices want to replace Mississippi’s approach, they may be reluctant to do so in a way that causes confusion too close to the election.

Crum, a Washington University in St. Louis School of Law professor. said the justices could strike down Mississippi’s law while leaving it in place for the midterms under the Purcell principle. a legal concept under which courts should strive to avoid changing voting rules too close to an election to avoid voter confusion.

Opponents of the Mississippi challenge argue that the consequences would be severe. The Democratic National Committee filed a legal brief warning of “disastrous consequences” if the court backs the Republicans. It said striking down Mississippi’s law—and imposing an inflexible Election Day deadline for receiving mail-in ballots—could disenfranchise millions of voters. “including military voters stationed away from home. overseas citizens. rural voters. elderly and disabled voters. and voters lacking reliable transportation.”.

The fight is also playing out against a backdrop of shifting voter behavior. In the 2024 U.S. election, 37% of Democratic voters reported casting ballots by mail, compared to 24% of Republicans, according to the MIT Election Lab. In the 2020 election, conducted during the COVID pandemic, 60% of Democratic voters and 32% of Republican voters cast mail-in ballots.

Republicans have said the court should narrow how far states can go in counting ballots that arrive late. A separate set of Supreme Court arguments—this time about money in politics—underscores the broader direction conservatives are pursuing this term. In another case involving Trump’s Vice President JD Vance. Republicans are seeking to chip away at legal limits on money in political campaigns. specifically restrictions on spending coordinated between party organizations and candidates.

That case is expected to be decided by around the end of June as well. and it carries its own election-year urgency: Republicans are defending slim majorities in both the House of Representatives and Senate in the November 3 midterms. If Democrats win control of either chamber. they could impede Trump’s legislative agenda and mount investigations of him and his administration.

In the mail-in ballots case. Chris McIsaac. a researcher at the R Street Institute libertarian think tank. said requiring mail ballots to arrive by Election Day is reasonable—but warned that administrative changes would be difficult in the final stretch. He pointed to the practical work election offices do before voting begins. saying election communications and instructions about when ballots are due are produced well in advance and would need to be reprinted if deadlines changed just months before an election.

Whether the court views the timeline problem as fixable—or as a threat to voters who depend on mail—could help decide what the midterms look like when counting begins. The Supreme Court’s answer is due by the end of June, but the tension is already visible in the calendar.

Supreme Court Mississippi mail-in ballots Election Day deadline Purcell principle midterms November 3 voting rights act Voting Rights Act Louisiana Trump JD Vance