First Mike Huckabee announced that he was flying to Los Angeles on the day before the caucuses to be a guest on the first broadcast of the Tonight Show with Jay Leno since Hollywood writers launched their strike two months ago. Will the burst of national attention be a boon for Huckabee's campaign? Or would he have been wiser to stick to traditional campaigning in Iowa? And will the fact that he didn't realize he would have to cross picket lines in order to tape Leno's show taint Huckabee's image as a populist defender of the little guy? Hillary Clinton managed to score a similar coup, but without all the negative side effects. She taped a segment for the Late Show with David Letterman, which also returned to the air last night for the first time since the strike. The difference: Letterman made a separate deal with his show's writers, who returned to their jobs, so Clinton could appear without running afoul of organized labor.