Unfortunately, HASC doesn't seem to have a transcript of yesterday's hearing ready, but Avi Zenilman's Politico article captures the key element of O'Hanlon's weird flip-flop:
"We have seized the initiative," Keane said. "Michael O'Hanlon's article lays that out."
"I agree with General Keane that trendlines are improving on the military, tactical level" O'Hanlon told the subcommittee. But of the surge strategy, he said: "I'm dubious, despite my generally inspiring visit last week."
In other words, while Jon Chait may feel that the argument of the O'Hanlon/Pollack essay "has some weight," it seems that O'Hanlon himself doesn't put that much weight on it.