Ned Foley and Josh Douglas for NYT Opinion:

Millions of Americans will head to the polls today, and many of them will confront some of the most serious obstacles to voting in decades, including strict new photo ID requirements in several states. No voter, however, should be turned away without the opportunity to cast at least a provisional ballot. In an environment in which partisan legislatures aggressively curtail voting rights, the protections provisional ballots offer are especially vital.