Although Obama has won the presidency, McCain may collect Missouri's electoral votes; he leads Obama by 5,853 votes with about 7,000 provisional ballots to count.
It will take another month before gamblers can enjoy Missouri casinos without the loss limit in place.
Peter Kinder retained his seat as lieutenant governor while Chris Koster was elected attorney general.
Paul Quinn, Stephen Webber, Chris Kelly, Mary Still and Steve Hobbs will make up Boone County's delegation to the Missouri House of Representatives for the next two years.
Boone County voters opted for Judy Baker with 58 percent of the vote, but in the end Blaine Luetkemeyer collected 50 percent of the vote in the district, which includes all or part of 25 Missouri counties.
The first-time candidate collected 48.5 percent of the vote to win the election by about 1,500 votes.
Republican attorney general candidate Mike Gibbons conceded the Missouri attorney general race to Democrat Chris Koster.
City voters approved a measure to issue $38.9 million in bonds to finance future renovations and additions to the city's water system over the next six years.
The Democrat was declared the winner by The Associated Press as soon as polls closed.
"Change has come," he declared to a huge throng of cheering supporters.
Most polling places in Boone County report high turnout.
Election officials have been reporting long lines at polling places across Missouri despite accounts of fraudulent messages telling voters to wait to vote until Wednesday.
Missourians have adopted an English-only amendment to the constitution, expanded options for storm water bonds, established a home-care attendant council and increased required renewable energy sources for publicly owned utilities to 15 percent.
A list of online news organizations' headlines about the presidential election.
There is no doubt that politics is divisive — even within families. Especially during the campaign season, the topic is unavoidable.
Barack Obama has won the presidential election, according to The Associated Press, The Washington Post, CNN and other news outlets. The AP's official electoral vote tally is 324 for Obama and 124 for John McCain. Two hundred seventy votes are needed to win.
See photos from Boone County voting Tuesday.
Some MU students were among the crowd who woke up early to beat the lines at polling places; by 2 p.m., about 1,600 people, most of them students, had voted at MU's Life Sciences Center.