Palin, the former Republican U.S. vice presidential nominee, joined Chambliss at a pair of fundraisers Sunday, CNN reported. The GOP incumbent is facing off against Democratic challenger Jim Martin, a former Georgia state legislator, in a runoff election to be held Tuesday.

Chambliss won a plurality of the vote Nov. 4, but Georgia state law calls for the winner to garner 50 percent plus one vote to be declared the winner. The presence of a third-party candidate drew enough votes away from Chambliss to force a runoff.

Palin joined a long list of GOP celebrities to visit Georgia on behalf of Chambliss. Others include former Republican U.S. presidential nominee Sen. John McCain of Arizona, as well as former GOP presidential candidates Mike Huckabee and Mitt Romney, the broadcaster said.

Martin's bid also has attracted support from top Democrats who want to move closer to obtaining a filibuster-proof 60-seat U.S. Senate majority.