Mostly, there was patience, good cheer, and for many, pride in taking part in a slice of history, whatever the result; had McCain won, his running mate, Alaska Gov. Sarah Palin, would have been the first woman to serve as vice president.
Lines began forming across the country before the sun had risen, with queues starting at 4 a.m. in New York City. The outcome across most of the Democratic-leaning Northeast was never in doubt, but many felt it was their responsibility -- and privilege -- to vote.
"I needed to cast my own ballot today, not just because it's my duty as a citizen but because for once it feels like it counts," said Eric Schwartz, 36, a computer specialist on New York's Upper West Side. "It's a more global feeling. Like I needed to make a mark on a day when things matter. Today, everyone matters."
Obama will be one of the youngest presidents in American history, the first born outside the continental United States (in Hawaii) and only the third to move directly from the Senate to the White House.
He burst on the national political scene just over four years ago, with an electrifying keynote address to the Democratic National Convention in Boston. His soaring speech previewed themes he would reprise in his presidential bid, including a call to end the partisanship symbolized by a country divided into Republican red and Democratic blue.
Months after that address, Obama won his Senate seat, and there was immediate talk of a run for president. The speculation, however, vastly understated the challenge facing Obama, who by his own admission entered the crowded Democratic field as an underdog. His victory over New York Sen. Hillary Rodham Clinton after a long, contentious primary season was in itself a major political upset.
Contrary to the wisdom at the time, the battle did not sap but rather strengthened Obama. He built campaign organizations in traditionally Republican states, such as Nevada, North Carolina, Colorado and Indiana, that came into play in the fall thanks to the groundwork laid in the spring.
Obama also became a better, more substantive candidate and a much stronger debater, which served him well in his three matchups with McCain. Obama's unflappable performance on stage and steady response to the Wall Street meltdown helped allay voter concerns about his judgment, maturity and readiness to assume office, undercutting what was perhaps McCain's strongest argument against the freshman lawmaker.