The author suggests that Krugman has "changed the way he thinks". I would like to suggest instead that his perspective of the world around him may have changed.

The author suggests that Krugman has "changed the way he thinks". I would like to suggest instead that his perspective of the world around him may have changed. For instance if he previously saw the liberals holding a disproportionate amount of power to sway public opinion, he may have attempted to re-balance the situation. More recently, he may see conservatives using economic rhetoric to push their own agendas, and follows his previous pattern of re-balancing the playing field. In both cases, he may be subtly promoting his own view, just in response to a changing audience. Of course my opinion is just a projection of my own perspective.