An emerging pattern?
1) Do something wrong in public, or get found out for clandestine wrongdoing
2) Denounce the ensuing flap as "liberal fluff" or "political correctness" regardless of the substantitive quality of the critique
3) Repeat step (1) only worse.
4) When you get in more serious trouble for (3), defend yourself by saying that you're being persecuted about (1), thus deflecting attention from (3) and upping your martyr credentials.
Incidentally, Summers, an economist, is also one of the 9 or ten people in the world who thinks that we need more pollution.