By ETHAN BRONNER
The November presidential election, widely expected to rest on a final blitz of advertising and furious campaigning, may also hinge nearly as much on last-minute legal battles over when and how ballots should be cast and counted, particularly if the race remains tight in battleground states.
In the last few weeks, nearly a dozen decisions in federal and state courts on early voting, provisional ballots and voter identification requirements have driven the rules in conflicting...