Therefore, Gingrich is running for office.

Klein proceeds to elaborate that Gingrich will occasionally say something rational when not running for office. Even if we assume that this is true, this is a far weaker claim than saying that Gingrich will exclusively say rational things when not running for office. And that strong claim is necessary to infer that Gingrich is running for office from the fact that he said something dumb and angry. My view is that Gingrich says dumb, angry things constantly and without regard to electoral ambitions. He is a dumb, angry man.