They also gave narrow victories to Republican incumbents Tom Worthan in the county chairman race, and Todd Cowan in the tax commissioner race.
Voters also approved Sunday liquor sales referendums in both Douglasville and unincorporated Douglas County, and overwhelmingly approved the charter school amendment to the state constitution.
Obama won 51 percent of the vote in Douglas County -- a county he also won in 2008.
Worthan received 52 percent of the vote, beating challenger Romona Jackson Jones by 1,700 votes out of 53,000 cast.
Cowan won by a similar percentage.
However, incumbent Sheriff Phil Miller had an easier race, winning 56 percennt of the vote to defeat challenger Derrick Broughton.
Douglas voters chose Sunday sales by retailers 63 percent to 37 percent. They chose Sunday alcohol sales by the drink by the same percentage.
More than 74 percent of the county's 74,000 registered voters turned out for the election.
Early in the day, heavy early morning rain did not deter voters from their civic duty in the western portion of Douglas County.
According to poll manager Angie Henry, 100 voters cast their ballots in the first 30 minutes at the Ephesus Baptist Church precinct.
Operating like a well-oiled machine, voters at Ephesus Baptist Church were generally in and out of the polling place with about a 25-minute wait, according to one voter.
Twenty voters were waiting for the polls to open when workers arrived at 6 a.m., Henry said.
“This is an excellent turnout for a day like this,” she said. “It is going really well. This is a really good precinct.”
There are 3,420 registered voters at the Ephesus Baptist Church precinct, said Henry.
Resident Bill Messer said that he was in line despite the heavy rainfall to “do my civic duty.” He admitted that he could have cast his ballot in early voting, but he enjoys voting in home precinct.
“I love these women here,” Messer said. “They do a fabulous job here. I wouldn’t miss the opportunity to come here and vote.”
Susan Jones said she had been voting in the same precinct for 10 years.
She came out despite the weather “just because our forefathers fought for our right to vote.”
Jo Lewis has been a volunteer poll worker for five years.
The 36-year community resident said that she volunteers “because I believe so strongly in the process and just want to do all I can so everyone can get in here to vote as quickly and efficiently as possible.”
Polls will be open at all voting sites until 7 p.m. tonight.