Gingrich, Paul this Sunday on Face the Nation

This Sunday's Guests are Republican Presidential Candidates Newt Gingrich and Ron Paul along with Michael Gerson of the Washington Post and CBS News's Chief White House Correspondent Norah O'Donnell and Political Director John Dickerson.

Is Super Tuesday make or break for the former House Speaker? With voters in 10 states going to the polls on Super Tuesday, Gingrich has hitched the viability of his campaign to winning his home state of Georgia.

"I have to win Georgia I think to be credible in the race," he said speaking to the Cobb County Georgia Chamber of Commerce this week.

"But if I win Georgia, the following week we go to Alabama and Mississippi, I think I'll win both of those, and we have a good opportunity to win in Kansas." Gingrich has pledged to take his fight all the way to the Republican convention in Tampa. In speeches throughout Georgia this week, he hammered his main opponents, former Massachusetts Governor Mitt Romney and former Pennsylvania Senator Rick Santorum.

"I don't think they are relevant because they are just politics, they are just the same old bologna. One is Massachusetts's moderate bologna, the other is Pennsylvania big labor bologna but they are bologna," he said.

He's also hitting President Obama for being "an incompetent radical" and for rising gas prices.

"At a minimum you can say, Obama much higher prices, Gingrich, much lower prices," he said. He's also making a big promise, to lower the price of gasoline through expanded domestic oil and gas exploration and development.

"One of my major themes is going to be $2.50 a gallon gasoline , because I believe it is absolutely doable."

Representative Ron Paul has based his campaign on liberty and he says his message is the one that best appeals to Republicans as well as independents and Democrats - to possible win in the fall.

He says though he hasn't won a single state outright, he's doing just fine. "We're still winning a lot of delegates, and that's what counts," he said this week. CBS News estimates that Paul has won 15 delegates so far, compared with 157 for Romney, 58 for Santorum and 30 for Gingrich.

Though Paul hit Senator Santorum for being a "fake" conservative in ads running last week in Michigan, Paul goes after all of his opponents in a new television ad running in key Super Tuesday states. Gingrich, the ad says, is "a serial hypocrite," Santorum a "counterfeit conservative" and Romney a "flip-flopper who's been on all sides." The ad says only Paul can "deliver real change, voting against every tax increase and every unbalanced budget, every time."

Can Gingrich or Paul win some SuperTuesday contests to further change the dynamics of the race? Can Romney continue his momentum and keep Santorum from big wins in Ohio and Tennessee? Is the Gingrich campaign back from the dead again? And can Paul's loyal followers keep him in the delegate hunt?

Those will be among the issues as candidates Ron Paul and Newt Gingrich join Bob Schieffer to Face the Nation.

Be sure to tune in on Sunday -- check your local listings so you don't miss a minute.

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    Robert Hendin is senior producer for "Face the Nation" and a CBS News senior political producer.