The Democrats have tightened their grip on the U.S. Senate. But the size of their majority isn't clear, because at least three races are still undecided.
It looks like there will be a run-off in Georgia between Republican Sen. Saxby Chambliss and Democrat Jim Martin.
"The official standing of the Chambliss campaign is that we're prepared for a runoff," Chambliss said. "We have already hit the ground. We are already organized for this runoff."
A recount will also be conducted in Minnesota as incumbent Republician Norm Coleman leads Democratic challenger Al Franken by only about 500 votes.
"Let me be clear. This race is too close to call," Franken said. "And we do not yet know who won. We are lucky enough to live in a state with built-in protections to ensure that in close elections like these, the will of the people is accurately reflected in the outcome."
Ballots are still being counted in Alaska, where Republican incumbent Ted Stevens leads challenger Mark Begich by less than 3,400 votes.
In Oregon, Democrat Jeff Merkley narrowly defeated Republican incumbent Gordon Smith. Smith was the lone Senate Republican on the Pacific Coast.
The Democratic win gives the party at least 55 seats, with the Republicans holding onto 40 and Independents taking two.