Voting errors tallied nationwide

In the month since the election, serious instances of voting machine problems or human errors in ballot counts have been documented in at least a dozen states, each involving from scores of ballots to as many as 12,000 votes, as in a North Carolina county. On Election Day, or in later reconciling tallies of ballots and voters, local officials discovered problems and corrected final counts. In some cases, the changes altered the outcomes of local races. But in North Carolina, the problems were so serious that the state may hold a rare second vote, redoing a contest for state agriculture commissioner decided by fewer votes than the number of ballots lost.