Nancy Reagan greets presidential candidates before the Republican debate at the Ronald Reagan Presidential Library in Simi Valley, California

Former first lady Nancy Reagan (C) shares a light moment with presidential candidates Rick Santorum, Newt Gingrich, Michelle Bachmann, Mitt Romney, (Nancy Reagan), Rick Perry, Ron Paul, Herman Cain and Jon Huntsman Jr. (L-R), before the start of the Republican presidential primary debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 7, 2011. UPI/Chris Carlson/pool