Also known as the Overton window: http://en.wikipedia.org/wiki/Overton_window http://en.wikipedia.org/wiki/Overton_window "At any given moment, the “window” in

Also known as the Overton window: http://en.wikipedia.org/wiki/Overton_window http://en.wikipedia.org/wiki/Overton_window "At any given moment, the “window” includes a range of policies considered to be politically acceptable in the current climate of public opinion, which a politician can recommend without being considered too “extreme” or outside the mainstream to gain or keep public office. Overton arranged the spectrum on a vertical axis of “more free” and “less free” in regard to government intervention. When the window moves or expands, ideas can accordingly become more or less politically acceptable."