(CNN) - Nine days after losing the presidential election to Barack Obama, John McCain is back on the campaign trail.
The former GOP presidential nominee will stump for fellow Republican senator Saxby Chambliss today in Georgia.
The freshman senator most likely faces a run-off election December 2 against Democrat Jim Martin, a former state lawmaker.
At the start of the campaign, Chambliss was the heavy favorite in the race. But the contest tightened, and neither candidate won more than 50 percent of the vote on Election Day, thanks in part to a third-party candidate who won 3 percent of the vote. The race appears headed to a runoff between Chambliss and Martin.
The runoff is expected to become official later this week, after the state certifies the election results. Unofficial tallies show Chambliss with 49.8 percent of the vote, just short of the 50 percent plus one vote need to win. Martin has 46.8 percent of the vote.
McCain will join Chambliss at a campaign rally in suburban Atlanta this afternoon. McCain won Georgia's presidential vote 52 percent to 47 percent. President Bush carried the state by 17 points in his 2004 re-election victory.
Former Republican presidential candidate Mike Huckabee is expected to campaign for Chambliss in Georgia this weekend, and an appearance by another former Republican presidential candidate, Mitt Romney, is also possible.
Martin is hoping that President-elect Obama will come down to Georgia for an assist. While there's no guarantee that will happen, Obama is dispatching campaign aides to Georgia to help Martin in his runoff efforts.
A victory by the Democrats in Georgia could help determine if the party reaches its goal of reaching 60 Senate seats, which would give the Democrats a filibuster-proof majority in the chamber. A filibuster is a move that allows the minority party in the Senate to stall and even block votes on legislation. Sixty votes are needed to overcome a filibuster.