The classic name for the "Keep moving the extremes so people's opinion converge on the gradually moving middle" is called the Overton window and politicians try

The classic name for the "Keep moving the extremes so people's opinion converge on the gradually moving middle" is called the Overton window and politicians try to employ it all the time: http://en.wikipedia.org/wiki/Overton_window http://en.wikipedia.org/wiki/Overton_window