The Supreme Court heard oral arguments on Monday in Watson v. Republican National Committee, and anyone hoping the conservative majority might show some restraint was disappointed within the first ten minutes. The case challenges a Mississippi law that allows mail-in ballots postmarked by Election Day to be counted if they arrive within five business days. The RNC and Mississippi Republicans argue the law violates federal statutes establishing a uniform Election Day for federal offices.
The justices were divided along predictable ideological lines, but the math is the math: six conservatives, three liberals, and a question that maps neatly onto the partisan divide over mail-in voting that has defined American elections since 2020.
The Conservative Argument
Justice Samuel Alito set the tone early, asking Mississippi's solicitor general why the state believed it could effectively extend Election Day by five days through administrative policy. Chief Justice John Roberts pressed on the plain text of the federal statute, noting that Congress had chosen the word "day" — singular — not "period." Justice Neil Gorsuch questioned whether states had any authority to override what he characterised as a clear congressional mandate.
The through-line was unmistakable. The conservative justices were not asking whether Mississippi's grace period was good policy. They were asking why it was not obviously illegal.
What Is at Stake
If the court strikes down Mississippi's law, the ruling would almost certainly invalidate similar grace-period provisions in California, Illinois, Ohio, Virginia, and ten other states plus the District of Columbia. The timing could not be more consequential: a decision is expected by late June, giving election officials barely four months to overhaul their procedures before the November midterms.
The practical impact would fall disproportionately on voters who rely on the postal service — rural voters, elderly voters, voters with disabilities, and military personnel stationed overseas. In the 2024 election, an estimated 2.3 million ballots arrived after Election Day but within their states' grace periods. Under a broad ruling, every one of those ballots would have been discarded.
The Liberal Dissent in Preview
Justice Sonia Sotomayor pushed back forcefully, arguing that the federal statute establishes when an election occurs, not when every ballot must physically arrive at a counting centre. Justice Ketanji Brown Jackson noted that absentee voting has existed since the Civil War and that Congress has never moved to prohibit grace periods despite decades of awareness that they exist.
But the liberal justices are outnumbered, and they know it. The question is not whether the court will rule against Mississippi's law. The question is how broadly it will do so, and whether election officials in 14 states will have enough time to prevent chaos in November.