DISCLAIMER: is this photo sexist? I think not. Yes, it's unflattering and sexual and crude. But I think it would be just as funny if it were a picture of Rick Santorum or Newt Gingrich doing the same thing (see also: mirth at photos of Dick Cheney's pants passenger, which is apparently impressive by anyone's standards).
Ladies and gentlemen, THE photo of Michele Bachmann (forget that Newsweek cover photo):