Moore probably got the video from the same people that gave the RATs.com and other websites detailed information on the President's visits as what intersection he would be at at what time. That happened during more than one of his visits and on the Florida visits.
You could read absolutely detailed scheduling that only USSS and local police would have on the Internet. But then how did someone get the codes for AF One to use on 9-11?
My guess is that a Clintonite worked in the office where video's and the like are made and got Moore a copy.
Bush's biggest error was not flushing every damn Clinton employee when he took charge.