Rick Santorum, Pennsylvania's junior U.S. senator, was first elected to the Senate in 1994. It has been widely reported that the Catholic Republican and outspoken pro-life advocate will face challenge from another pro-life Catholic, Democrat Bob Casey Jr.

Senior associate news editor Stan Guthrie spoke with Santorum.

President Kennedy tried to draw a bright line between his Catholic faith and his decisions as a public official. Governor Arnold Schwarzenegger of California, another Catholic, said much the same thing recently during an interview with George Stephanopoulos. What role does your faith play for you as a senator?
I draw no line, much less a bright one. I think your faith molds and influences tremendously your worldview—just like, by the way, a whole lot of other things that are in your life. But to me, faith is source of morality; it's a source of virtue; it's a source of reason. It's a tremendous influence on my worldview. And while obviously there are other things that influence my decision-making and how I look at the world, it's certainly an important part of it.

The idea that we cast aside our faith and don't replace it with something else to influence your worldview is ridiculous. If you don't have faith, you replace it, I assume, with some secular concepts, or with some other belief system, which goes unidentified. I think that really is—I won't say dishonest, but I think it certainly lacks intellectual honesty to say that by removing your faith as a component of how you conduct yourself that you somehow can do so neutrally. You don't. You just do so with another worldview or another set of values that come from another source.

How do you respond to those who might accuse you of attempting to legislate ...