MEGAN MCARDLE: Polling mysteries.

UPDATE: From the comments, there’s this explanation:

I find all these poll numbers fit very neatly within the same change in viewpoint, which perhaps is best summed up by:

January: Hooray, we’re saved!
Now: Holy crap, these guys don’t have a frickin’ clue about anything, do they?

Every once in a while, the cult of the expert implodes in this country, and the bulk of the citizenry stops believing in anything they say, whether it’s about health care, the economy, or climate change. A mulish conviction that it’s all being made up on the fly to feather well-connected nests sets in.

Yes, I think that could be the way things are moving.