Via the Examiner, I understand why he punted here. His retort to Reid's tax-evasion smear last night was that it's an obvious, grotesque attempt to hand the media a new distraction from Obama's record. He just got back from a foreign policy trip/photo op that was also submerged in distractions, most notably his Olympics comments in London and his aide's "kiss my ass" comments to the press in Poland. He's just begun pushing a more positive message keyed to his biography to convince undecideds that he's up to the job. The last thing he wants right now is another distraction...