Reagan Library, Simi Valley, California, September 7 2011 –  Michele Bachmann, Herman Cain, Newt Gingrich, Jon Huntsman, Ron Paul, Rick Perry, Mitt Romney and Rick Santorum participated in the Fourth Republican presidential debate of the 2012 campaign season sponsored by MSNBC and Politico

Hosted by Brian Williams (MSNBC) and John Harris (Politico)