LANCASTER, Pa. - Two of the Republican candidates for president are in Pennsylvania a week ahead of the state's primary election. Mitt Romney, the GOP's all-but-certain presidential nominee, and Newt Gingrich, are scheduled to speak at the Republican Committee of Lancaster County’s spring event in Lancaster on Tuesday evening. Rick Santorum, who suspended his campaign last week, has canceled his appearance. Santorum, a former Pennsylvania U.S. senator, hasn't hinted whether he'll eventually endorse Romney, but said he'll say soon how he'll continue to press for conservatism in politics.