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Charles Dharapak, AP
Republican presidential candidate, former Pennsylvania Sen. Rick Santorum, speaks at his primary election night rally in Gettysburg, Pa., Tuesday, March 20, 2012. (AP Photo/Charles Dharapak)

GETTYSBURG, Pa. — Rick Santorum says freedom and curbing big government's reach are the overriding issues in the presidential race.

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Despite his loss to GOP front-runner Mitt Romney in the Illinois primary, Santorum is pressing ahead with his campaign. The former Pennsylvania senator spoke to supporters Tuesday night at a campaign event in Gettysburg, Pa., the site of President Abraham Lincoln's famous Civil War address.

Santorum is bracing for a long contest with Romney, who has more money, delegates and organization. Santorum, however, has enough cash to continue trying to deny Romney the nomination.

Next up is a primary in Louisiana on Saturday. Santorum is hopeful following twin triumphs a week ago in Alabama and Mississippi.