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Georgia voters “are sick and tired of what is happening in Washington,” Mr. Martin said at a recent press conference. “They want someone to stand up for the middle class. They know that I will do that. … Yes, the TVs are cluttered with some of the ads, some of them are reprehensible, but that’s the nature of politics in this country now.”

On the stump, Mr. Chambliss is running as much against Mr. Obama and the Democrat-led Congress as he is against Mr. Martin.

“We know the direction in which they are going to take us, [and] we have the opportunity to make sure that we are that firewall, that 41st vote to make sure that we don’t have our taxes raised, to make sure that we have the right kind of judges going to the bench, not liberal activist judges,” Mr. Chambliss said at a rally at the Right Wing Tavern in Woodstock, Ga.

“Jim Martin will provide that blank check to do all of those things, … but you can make the difference,” he told the more than 200 people who filled the bar, a focal point of politics in the Republican stronghold of Cherokee County, which is north of Atlanta and key to Mr. Chambliss’ runoff strategy.

Mr. Chambliss was joined at the rally by former Republican presidential candidate and former New York Mayor Rudolph W. Giuliani, one in a parade of political celebrities stumping in Georgia that included Mr. McCain.

On the Democratic side, Mr. Martin garnered visits from former President Bill Clinton and former Vice President Al Gore.

Alaska Gov. Sarah Palin, who became a political star as the Republican vice-presidential nominee, will make about four campaign stops Monday with Mr. Chambliss to jump-start the crucial get-out-the-vote drive after the long holiday weekend.