Because Homeland Security was one of the debate topics.
Perhaps we should all remove our tin-foil hats so that we can focus on what is more important.
Note that my agreement on what I saw was only an obvious "bias" on the part of Lehrer. Nobody really doubts that. However, I seriously doubt that sKerry had the questions in advance, especially on the heels of Rathergate. Let's all get a little more serious.