In the chilly climes of the upper part of Michigan's lower peninsula,Joe Overton has the kind of job that gives him time time to do a lot of thinking. Actually, he works for a think tank His idea is as follows:Politicians can only voice opinions within a band from left to right that falls within the political spectrum. To voice opinions outside the acceptable space is to invite sure defeat Working within the window, a politician can be pretty sure that nothing he has said will get him condemned. Along comes Donald Trump. He seems to be saying all sorts of things outside the window.He should pay a heavy price for that because it proves that he is not "Presidential." However, what the current potfull of pols fail to recognize is that the Overton Window has shifted, making all those no-no opinions acceptable, even desirable. Trump recognized the shift and used it with a joyful vivacity. What he realized was that certain "down and dirty" phrases and expressions were now common usage, expressed freely by most people and no longer shocking, except to his opponents. They are still mumbling over the fact that his words are unacceptable. Maybe that was true as late as 1990, but not today.