Regular Econlog commenter Ray Lopez writes, in response to Scott Sumner:

My first objection: aside from the “Open Letter” by the liberal leaning economists, that indeed predicted a ‘double-dip recession’ if sequestration happened, who else predicted a recession? Not the CBO (which uses a Keynesian model to forecast). Not Krugman (who merely thought the USA might follow the trajectory of the UK). Then who? What am I missing?

I think he’s missing who is on the list of 350 economists who signed the open letter. Here are 6 prominent ones, alphabetically:
Dean Baker
Jared Bernstein
Lawrence Mishel
Peter Temin
Robin Wells
Justin Wolfers.

Like commenter Tracy W, I find that Ray Lopez’s comment reminds me of the great scene in the movie The Life of Brian.