Several U.S. states still are not doing all they can to ensure the accuracy of votes over electronic voting machines, and 10 states received inadequate grades in three of four categories of safeguards, a report from three voting security advocacy groups said. Somewhere in the United States, voting systems will fail on Election Day Nov. 4, predicted the report, released by Common Cause, Verified Voting and the Brennan Center for Justice at the New York University School of Law.