Raise the level of the debate! Address the issues he raises! So cry the many enthusiastic supporters of Professor Krugman.
Daniel Drezner obliges here.
Jane Galt obliges here.
At Dr. D's site, one of the earnest K-supporters has an interesting suggestion - serious Krugman critics should restrict themselves to what Prof. Krugman writes, not what he says, as in, for example, the CalPundit interview linked by Dr. Drezner.
Since the particular topic was income inequality and political polarization, we oblige. Stay with me, there are banana peels coming, I promise. Two substantial ones, actually - Prof. Krugman apparently failed to read the final version of a paper to which he linked. Although the draft version (found elsewhere) supports his conclusion, the final version to which he linked does not.
And, we drag in a couple of experts to argue that immigration has a significant affect on inequality statistics in the US. Since Prof. Krugman totally fails to mention this, we deem it to be an important oversight.
Unleash the hounds!