Bruce Bartlett misstates the problem
The problem is that the Obama administration was much too optimistic about how quickly stimulus spending would affect the economy. Christina Romer, chair of the Council of Economic Advisers, and Jared Bernstein, chief economist to vice president Joe Biden, forecast in January that the stimulus would reduce unemployment almost immediately.
Um, that’s totally false. Did Bartlett even look at the Bernstein-Romer paper? Here’s the key graph: