The Supreme Court appears poised to overturn a Mississippi law allowing mail-in ballots to be counted as long as they are postmarked by Election Day. On Monday, the court’s right-wing majority appeared to reject arguments that mail-in ballots are consistent with federal election laws because voters make their final choices by Election Day. More than two dozen states have similar laws, meaning the Supreme Court’s ruling, expected by June or July, could have a big impact on November’s midterm elections.