Krugman's claims raise an obvious question: Have US droughts actually become more common on climate time scales? Especially US Midwest droughts?
Instead of looking at the musings of a "climate blogger" (as entertaining as that may be) like Krugman does, let's instead look at scientific research that has examined trends in US droughts. A crazy idea, I know. Fortunately, scientists have examined empirical data on the frequency and severity of drought on climate time scales.
[D]roughts have, for the most part, become shorter, less frequent, less severe, and cover a smaller portion of the country over the last century.