Yes, he did. In an interview with Beliefnet's Dan Gilgoff after his civic forum, Rick Warren said that "If they [evangelicals] think that life begins at conception, then that means that there are 40 million Americans who are not here [because they were aborted] that could have voted. They would call that a holocaust and for them it would like if I'm Jewish and a Holocaust denier is running for office. I don't care how right he is on everything else, it's a deal breaker for me. I'm not going to vote for a Holocaust denier."
Warren also told Gilgoff that Democrats' efforts to talk about faith alone fall flat: "just because a person can say 'God' and 'Jesus' and 'salvation' and whatever doesn't mean they have a worldview. And people want to know what do they believe, not just their personal faith."