As dawn broke in the frosty Northeast, the GOP publicly relished the possibility that a previously obscure state senator, Scott Brown, could wrest the election from Democrat Martha Coakley, considered the overwhelming favorite until just a few days ago.
In contrast to the light turnout for the party primaries last month, both candidates expected a heavy turnout following the national attention thrust upon their race. There was a clear sign at one polling place: A line of cars stretched for nearly a half-mile from the gymnasium at North Andover High School, the polling place for a community of about 30,000 about a half-hour north of Boston. Some drivers turned around in exasperation.
Massachusetts has a liberal reputation, but a full half of voters here are registered independent. Despite his conservative record, Brown has been tapping in to that independent streak, reports CBS News correspondent Nancy Cordes.
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Speaking to reporters after she voted early Tuesday at an elementary school near her home, Coakley voiced confidence that she would win, saying "we've been working every day."
She said "we're paying attention to the ground game. ... Every game has its own dynamics. ... We'll know tonight what the results are." The polls close at 8 p.m. EST.
Brown drove himself to the polls in the green pickup truck that came to symbolize his workmanlike campaign. Pulling into an elementary school in his hometown of Wrentham, the truck had registered 201,171 miles on its odometer.
Brown played down the import of becoming the 41st Republican vote to uphold a filibuster, telling reporters, "It would make everybody the 41st senator, and it would bring fairness and discussiuon back to the equation."
He also said that should he win, he hoped Democrats controlling the state's election apparatus "would do the right thing and certify me as quickly as possible."
While there were signs of a heavy turnout, including 500 ballots through the machine that counted Brown's about 9:45 a.m., he dismissed polls showing a swell of support for him.
"I've never been a big poll person," he said. "I'm up in some, I'm down in some. And we'll see what happens, 8:01 (p.m.)."
As people headed to work in Boston, the area's leading all-news radio station was filled with Brown get-out-the-vote ads. He was getting a similar boost from the conservative-leaning hosts of the area's leading sports talk station. Eastern Massachusetts also was hit with intermittent snow showers, placing a premium on motivated voters.
A light snow has been falling steadily north of Boston since just after the polls opened, covering roads and sidewalks with a slippery coating. Some voters in Haverhill, about 35 mile3s north of Boston, grumbled as they navigated snow banks and thick slush to get to the polls.
In Cambridge, a typically liberal stronghold, Coakley supporters were out in force, holding signs at major intersections during the morning commute.
In the race to fill the late Sen. Edward M. Kennedy's Senate seat, Republicans want Brown to become their 41st vote in the 100-member Senate. That would give them enough votes to successfully filibuster Democratic initiatives, including the massive health care bill that majority Democrats are rushing to finish.
Obama campaigned personally for Coakley on Sunday, urging Democrats to get out and vote, and he also appeared in an eleventh-hour TV commercial on behalf of the attorney general.
"I think it's been a fascinating process to watch unfold," Republican Party Chairman Michael Steele said in an interview as the polls opened. "A year ago, the landscape was very different than we see it today. ... The American people have begun to take charge in these elections."
Steele said that if Brown is successful, the Democrats must quickly seat him. To do otherwise, he said, would be "an unseemly thing."
Former Democratic chairman Terry McAuliffe said in an interview that his party must get a strong turnout, acknowleding "an anti-incumbency mood out there."
The swift rise of Brown has spooked Democrats who had considered the seat one of their most reliable. Kennedy, who died in August, held the post for 47 years. The last time Massachusetts elected a Republican to the U.S. Senate was 1972.
Brown has tried to turn Democrats' expectation of an easy win to his advantage, proclaiming, "It's not the Kennedy seat, it's the people's seat."
It's unclear whether a full-court press by unnerved Democrats was enough to blunt the surging Brown.
A Suffolk University survey taken Saturday and Sunday showed Brown with double-digit leads in three communities the poll identified as bellwethers: Gardner, Fitchburg and Peabody. But internal statewide polls for both sides showed a dead heat.
For Brown's staunchest supporters, such as Glen Stump, 47, a software engineer from Andover, Democrats' appeals fell on deaf ears.
"I hope he can stop this Obamacare legislation," Stump said, using critics' nickname for the health care overhaul bill. "I think it's being run in a completely partisan manner."
A third candidate, Joseph L. Kennedy, a Libertarian running as an independent, said he's been bombarded with e-mails from Brown supporters urging him to drop out and endorse the Republican. Kennedy, who was polling in the single digits and is no relation to the late senator, said he's staying in.