>> mark, thanks so much in washington. of course, we're still learning more about the raid on bin laden's compound. on cnn's "fareed zakaria: gps" today, the courier was first identified during the bush administration. >> i think it was about four years ago in 2007, we had built up sufficient lead information on the name of the courier that we thought it was ready for presidential primetime. so we briefed it to the president not as something imminent, but as our most promising lead to track down bin laden. >> so this is classic human intelligence. you had people on the ground. they talked to people. they developed relationships. is that right? >> it is. but it also came out of detainee interrogations. one of the more prominent leads we had at the beginning of this exercise was partial identity information that came out of