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Santorum's comments come after his losses Tuesday in Arizona and Michigan, where he gave GOP front-runner Mitt Romney a tough race. Both men campaigned hard in Michigan but immediately moved on to the Super Tuesday states — Santorum was in Ohio on Tuesday and will be in Tennessee on Wednesday. Shortly after his radio appearance, Santorum said that he also expected to do well in Ohio.

"We feel very confident that we’ll do extremely well there. We’re doing battle" Santorum said the same morning on Fox News.

Romney is in Ohio Wednesday, and Gingrich is in Georgia.

Oklahoma's senators have weighed in on the primary. Sen. Tom CoburnTom Coburn-trillion debt puts US fiscal house on very shaky ground Al Franken: 'I make fun of the people who deserved it' The more complex the tax code, the more the wealthy benefit MORE (R-Okla.) has not endorsed and Sen. James InhofeJames (Jim) Mountain InhofeA third of Congress hasn’t held a town hall — it’s time to take action Anonymous affiliate publishes claimed list of GOP private contact info Wasting America’s nuclear opportunity MORE (R-Okla.), previously a Rick Perry backer, has not endorsed again. Inhofe, however, recently said that Santorum is his preferred candidate on the economy, defense and energy.

"In terms of the candidates that are there right now, I’d certainly say Rick Santorum has a better record addressing the four major issues that concern me," Inhofe said earlier in February.

Inhofe also said at the 2012 Conservative Political Action Conference that he knows the former Pennsylvania senator very well.

"I know his heart," Inhofe said at the conference. "I probably know Rick Santorum better than anyone in this audience."

—This story was updated at 10:46 a.m.