The fate of American elections is in Amy Coney Barrett’s hands

A pair of cases are currently pending before the Supreme Court that could fundamentally rewrite the rules of US elections.

Both cases are redistricting cases. In Moore v. Harper, the North Carolina Supreme Court struck down gerrymandered congressional maps drawn by the state’s Republican legislature. In Toth v. Chapman, the Pennsylvania Supreme Court selected a congressional map for the state after its Republican legislature and Democratic governor deadlocked on what that map should look like.

In both cases, Republicans claim that state courts are not allowed to intervene in redistricting cases because...