I read Rick's email re: this event. Perhaps someone from Saddleback would post it here, if that would be appropriate. 
Basically, Rick talks about "the story behind the story." He also mentions the $2 million they need in the next 30 days to update their 15 year-old video equipment (to provide the video feed for the networks), which he says they've needed to do anyway. Yikes. They also have to figure out how to figure out who gets to attend -- 6,000 seats, 100,000 people in their database (not to mention VIPs).
It's a great opportunity for Saddleback and with Rick Warren asking all of the questions, it could actually be a productive political discussion!
In the email, Rick writes ...
Most debate, town hall, and media questions tend to be about hot political issues, or attempts to play "gotcha" for partisan points. In contrast, I intend to ask questions about factors that have historically determined presidential effectiveness. I'll ask about their understanding of the constitution, personal leadership convictions and style, philosophy of the role of government, America's role in the world, competence and character issues. They certainly won't be softball questions.
I'm looking forward to it. And I've never said that about any event during this never-ending campaign!