By The Editorial Board Feb. 28, 2021 6:00 pm ET Election laws have become a dangerous political flashpoint, as Americans recently learned the hard way. On Tuesday the Supreme Court will hear a potentially landmark case (Brnovich v. DNC) that offers an opportunity to restore the Voting Rights Act to its original purpose. At issue is Arizonas requirement that voters cast ballots on election day in their assigned precinct and its ban on ballot harvesting by outside groups. A majority of states require in-precinct voting, and 20 or so limit ballot harvesting, which allows third parties to collect ballots in bunches. Both rules are intended to bolster ballot integrity.