He went to Huntsville, Alabama Thursday in an attempt to win votes.
Coming off his Super Tuesday wins in neighboring Tennessee and in Oklahoma, Santorum is claiming he's the only conservative running, and that he's what Republicans need in the fall.
After his Super Tuesday win in Georgia, Newt Gingrich, too, is counting on the South, where a lot of Republicans drive big trucks.
As gas prices are rising, the Justice Department is investigating, and Congress is arguing
about a new oil pipeline, the price of gas is Newt's big issue.
Still, aides hint Gingrich might drop out if he loses southern primaries.
Santorum believes that will give him a major boost.
"When it becomes a two person race for the Republican nomination, the conservative will win that nomination," he told supporters Thursday.
But that might not be the case.
Critics call Mitt Romney a weak frontrunner, but so far he is earning enough delegates to keep his rivals from clinching the nomination before the August convention in Tampa, even if he falls short.