Cathy Willauer, who is Roman Catholic and a mother of four, says that her religion is important to her and that she shares the same values as Rick Santorum.

But Mrs. Willauer, 50, who lives in Annapolis, Md., has decided to support Mitt Romney in Maryland’s Republican presidential primary on April 3. She said she had more confidence that Mr. Romney, a former governor of Massachusetts, could better manage the economy.