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That might explain this:
McCain: Michael O’Hanlon and Kenneth Pollack have uncovered a truth that seems to escape congressional Democrats: General Petraeus’s new strategy has shown remarkable progress. […]
I cannot guarantee success. But I do guarantee that, should Congress fail to sustain the effort, and should it pay no heed to the lessons drawn by Mr. Pollack and Mr. O’Hanlon, [blah, blah, blah] Think Progress http://tinyurl.com/22htd7
I haven't seen any of the other Republican contenders refer to the Pollack-O'Hanlon op-ed. Rasmussen says, “...many commentators continued to identify Arizona Senator John McCain as the frontrunner.”
Glenn's panel discussion might also be webcast here: http://www.yearlykosconvention.org/ustream