Programming errors and inexperience dealing with electronic voting machines frustrated poll workers in hundreds of precincts Tuesday, delaying voters in several states and leaving some with little choice but to use paper ballots instead. In Indiana's Marion County, electronic optical-scan machines that read paper ballots initially weren't working right in more than 100 precincts. Election officials in Delaware County, Ind., and Lebanon County, Pa., extended polling hours because of early machine troubles blamed on bad programming. Republicans in Passaic County, N.J., complained a ballot had been pre-marked on some machines with a vote for the Democratic Senate candidate. In Colorado, Democratic Party officials said they would ask a state judge to keep Denver polling places open an extra two hours Tuesday because of long lines. A national Election Protection coalition logged 9,000 calls by noon on [their elections] hotline. In one case, a poll worker unintentionally wiped the electronic ballot activators. Some machines...jammed when they were turned on. One location suspended voting for 45 minutes because it received the wrong machine. But voting equipment companies said they hadn't seen anything beyond the norm and blamed most of the problems on human error. Nearly half of all voters were using optical-scan systems. Thirty-eight percent were casting votes on touchscreen machines that have been criticized as susceptible to hackers. Many states established voter registration databases for the first time and found problems matching drivers' license and Social Security data with voter rolls, sometimes simply because of a middle initial.