The usually astute Josh Marshall has this observation:
Toward the end of the campaign, basically in September, McCain took a series of steps that began to crack his credibility and reputation. He and his campaign told a series of falsehoods that were so outside the bounds even by the normal standards of political lying and took a number of steps that where so erratic and reckless (Palin, campaign suspension, etc.) that the nature of his coverage finally began to change.
McCain did that. Halperin should stop complaining, put some limits on pandering to the curdled resentment of the right.