AFL-CIO Presidential Candidates Forum in Chicago on Aug. 7.

Keith Olbermann, whose biting, pull-no-punches commentaries on MSNBC’s “Countdown with Keith Olbermann,” have been known to spike the blood pressure of their targets—ask Fox News’ belligerent right-winger Bill O’Reilly—will moderate the AFL-CIO Presidential Candidates Forum in Chicago on Aug. 7. The forum, with the seven leading Democratic candidates, will be broadcast live from 6 p.m.-7:30 p.m. CDT (7 p.m.-8:30 p.m. EDT) on MSNBC and XM Satellite Radio.