Rachel Maddow talks to Left Behind authors Jerry Jenkins and Tim LaHaye. Bob Cesca makes a good point about Rachel's emphasis in the 65 million copies of Left Behind that have been sold:

Adding... 65 million copies sold. But I don't know if book sales are any indication of popularity. Sure, the Left Behind series is popular among the wackaloons, but it's also well-documented that various wealthy wingnuts like Richard Mellon Scaife literally buy up thousands of copies of books in order to artificially inflate sales figures.