Last month, Katharine Q. Seelye of the New York Times live-blogged the Democratic presidential debate in Las Vegas. As the discussion bounced from subject to subject, she marked the topic and the time, then gave her thoughts. At 8:34 p.m., it was driver’s licenses; 8:55, Pakistan; 9:57, the Supreme Court. By night’s end she had 17 entries totaling almost 1,500 words. And she hadn’t typed “Iraq” once. The candidates mentioned the war, to be sure. But it never took center stage. And with the first primaries just weeks away, that’s become the norm: Iraq wasn’t a major focus at last week’s Republican YouTube debate either. In the biggest surprise of the campaign so far, the election that almost everyone thought would be about Iraq is turning out not to be. And that explains a lot about which candidates are on the rise and which ones are starting to fall. The reason Iraq is fading is simple: Not as many people are dying there.