of America . We 're going to look at a section on world view -- all of the minefield questions that no matter how you answer them , somebody 's not going to like it . Then we 're going to look at America 's role internationally . How we 've been a blessed nation and how should we bless others . Roberts : Are you going to ask them about issues like abortion and same-sex marriage ? Pro-life advocates are hoping you do . There has been some criticism in some corners you have been soft-pedaling political issues that are central to evangelicals . Warren : I think everybody will be surprised . I 'm going to ask all of the tough questions . I just intend to ask them in a civil way . This is called a civil forum , which means you can disagree without demonizing the opposition . I think everybody wants to hear questions not just about those `` moral issues , '' but also about a lot of other things , too . I 'm trying to stake out a common ground for the common good . Roberts : When you take a
-LRB- CNN -RRB- -- The Rev. Rick Warren , often called America 's most influential pastor , will be hosting Sens. Barack Obama and John McCain for what 's being called the civil forum on the presidency . Rick Warren will be hosting the civil forum on the presidency Warren , who heads up the country 's fourth largest church , is also an author whose books have sold more than 30 million copies . The candidates will appear together at Warren 's 20,000-member Saddleback mega-church in southern California where they each will be interviewed for an hour . Warren spoke with John Roberts on CNN 's American Morning about what he hopes to accomplish at the forum . John Roberts : What do you want to hear from candidates Saturday night ? Rick Warren : You know , John , we 're going to look at four different segments . One is a segment on leadership . What is the personal character , competence , and experience of each of these guys . One section will be on what I call stewardship -- the role and responsibility of presidency , what they believe about the constitution , the role