UC Davis Law professor Vikram David Amar and Illinois Law professor Jason Mazzone comment on a federal lawsuit filed by the Republican National Committee and the Republican Party of Mississippi, among others, challenging Mississippi’s law that counts mail-in ballots postmarked by Election Day but received within five business days thereafter for federal elections. Professors Amar and Mazzone argue that this lawsuit is unlikely to succeed due to the implausibility of its legal theory, highlighting the distinction between the act of voting and the counting of votes, and underscoring the constitutional and statutory framework that grants states broad leeway in election administration, including the acceptance of mail-in ballots.