Our editor just reported she's been in line for an hour, with at least another hour to go.

MISSOULA, Mont. – It is 7 a.m. and the polls have just opened in Montana. Voters in this state of about a million people will finally be casting ballots in the most expensive U.S. Senate race in state history. The contest pits incumbent Democrat Jon Tester against the state’s sole U.S. Rep. Denny Rehberg in a pricey battle that has subjected voters to more than 100,000 ad airings and thousands of mailings from the campaigns and outside groups. The outside money in this campaign has been so significant it prompted an entire Frontline investigation into what's been going on out here.

Globe reporter Bella English is at precinct 3 in Milton. "There have been steady lines since before polls opened at 7," she said. "Election warden Jane Tufts says that by 9 am today, the precinct has almost as many voters as it had all day for the September primaries. The process took me 30 minutes."