From Paul Krugman:
Yes, liberals are sometimes subject to bouts of wishful thinking. But can anyone point to a liberal equivalent of conservative denial of climate change, or the “unskewing” mania late in the 2012 campaign, or the frantic efforts to deny that Obamacare is in fact covering a lot of previously uninsured Americans? I don’t mean liberals taking positions you personally disagree with — I mean examples of overwhelming rejection of something that shouldn’t even be in dispute.
Or look at how liberals reacted to the woes of healthcare.gov. We heard a lot of talk about how it was Obama’s Katrina, or his Iraq. But was there anything like Bush’s “heckuva job” moment — which was matched by widespread insistence on the right that he was actually doing a great job? Was there anything like the years-long denial that anything was going wrong with the Iraq occupation? On the contrary, liberals were quick to acknowledge that the rollout was a disaster, and in fact sort of freaked out — which, as Noam Scheiber says, is what they usually do in the face of setbacks. And what’s more, as Scheiber says, that’s a good thing: faced with setbacks, liberals rush to fix things, rather than denying the problem. Hence the stunning Obamacare comeback.