political theory, and I may be wrong but I think it is "of the left"; it's not a particularly startling nor complicated theory (as the in-depth diagram to the left shows you: click on image to get "An Introduction to the Overton Window of Political Possibility"). It describes a 'window', the limits of which are the range of reactions that the public may have to any particular policy idea. The theory being the window moves either left or right (despite being up and down in that diagram) and can grow or shrink depending on the influence of politicians, lawmakers, opinion formers, public etc.
The up/down refers to any policy or 'collection of public policies' that "can be arranged in order from more free to less free (or alternatively, from less government intervention to more). To avoid comparison with the left-right political spectrum, [Overton] arranged the policies from bottom (less free) to top (more free)."
So the idea of moving the window is usually from 'the sides': ideas that maybe fringe or extreme will not usually be in the window because "[Politicians] will do what they feel they can do without risking electoral defeat, given the current political environment shaped by ideas, social movements and societal sensibilities." Knowing Glenn Beck there is no doubt what the book will really be about (not a well kept secret!): conspiracy theories galore involving a drastic shift to the left; Obama (thinly disguised) will be helping the spread of Socialism - and worse - in the U.S.A. I could be wrong.
"...politicians typically don't determine what is politically acceptable; more often they react to it and validate it. Generally speaking, policy change follows political change, which itself follows social change"
Anyway, apart from discussing how fast this book will become a Bestseller isn't the only debate raging across North America, the other (no, not Soccerball World Series [with thanks to The Sun]) but whether the strangely alluring and attractive Sarah Palin has a had a boob job or not! I think not but I'd like her to let me examine them to make sure.