I feel like we’re back in the pre-Iowa period when no one could figure out whether Donald Trump skipping the Iowa debate would hurt him–by the normal rules, of course it would hurt him; by the Trump rules, it wouldn’t make a difference and maybe even help (by demonstrating strength). By the normal rules, Trump embracing a blood libel about George W. Bush (he knew there were no WMD in Iraq), saying Planned Parenthood does great things, and often swinging wildly and angrily would hurt him a week out from a primary in Bush-friendly, hawkish, socially conservative South Carolina. But...