i think it's a valid question, actually.

is krugman, himself, more of a socialist than bernie sanders is?

you'd have to take some kind of weighted average, as this is a spectrum with more than two axes in it. 

but, sanders has kind of a conservative streak on very specific issues, and krugman is about as big of a government liberal as you'll find.

i would certainly compare krugman to roosevelt before i compared sanders to him.