>> yeah. >> he said those are the areas where the residents are most in danger. those are the residents where he said we're not going to send it to areas that don't have high crime. and so he explained it that way. he was data driven. so i understand that argument. i don't understand if you're data driven why you back down, why suddenly, david, it doesn't matter if that's what drove you to that argument even if it was unpopular the second you jump in a presidential race. >> it again afghanistan with an m.i.t. professor, mike bloomberg and ray kelly is then police commissioner enhanced it and they used comp stat, the computer system, which would indicate the specific neighborhoods, the data show the most larcenies, murders, assaults, that's where they chose to stop, start, and frisk.