Rick Warren is author of The Purpose Driven Life, which has sold some 30 million copies worldwide. He is the evangelical pastor of Saddleback Church in Orange County, California. Tomorrow, he'll be talking for one hour each to John McCain and Barack Obama, both of whom he calls "friends." The interviews will be back to back, but this is the first time the two will have been in the same place at the same time since becoming presumptive presidential nominees. We find out what to expect from the interviews, learn how a California evangelist landed such an event and discover the potential impact—on fundamentalist Christians and the rest of the voting public.