I knew about the thesis, everyone knows where Hillary's loyalties lie. I'm surprised the media is surprised about the letters.
Don't be fooled. They know, and have known. Sure, there is some segment of the media that are ignorant liberal kool-aid drinkers who discount Hillary's (and Bill's, and Obama's) admiration for Alinsky and his tactics as a right-wing creation.
But most of them know, and they can't afford to inform average Americans, many (if not most) who would not agree with or sanction the use of those radical tactics.
They can't afford to sacrifice one yard of ground gained for liberalism simply because they opened their mouths and informed people who might be aghast at those tactics.