Is It Possible That Churches Can Make That Kind of Difference?

Tim Keller started a Bible study on the Upper East Side in 1989. It grew from 15 people to several hundred, and now he's one of America's most influential pastors. Kevin O'Brien: Is it possible that churches can actually make that kind of difference even as networked up as they may be? "I've always wondered why John Piper doesn't get the kind of regard," says O'Brian.