The controversial former House Speaker seems to throw his hat in the ring as a GOP presidential candidate, and promises that health care reform will be the big issue. An exclusive FORTUNE interview. (Washington) -- Even a crisp Guinness stout can't chill the note of exasperation coming out of Newt Gingrich's mouth. "You still don't get it, do you?" he asks. The subject is the 2008 presidential race and whether the former Speaker of the House will run. The news is that Gingrich is running, but not on any official campaign trail. The radical realist who defied conventional wisdom 12...