Rep. Ron Paul. Patrick Smith/Getty Images hide caption

itoggle caption Patrick Smith/Getty Images

Republican presidential candidate, Herman Cain campaigned Wednesday in Dayton, Ohio. He told a Fox News interviewer he would decide in the next week whether to stay in the GOP race. Al Behrman/AP hide caption

itoggle caption Al Behrman/AP

Republican presidential candidate Newt Gingrich addressed large crowds at campaign stops like this one at Tommy's Ham House in Greenville, S.C. on Wednesday. Richard Shiro/AP hide caption

itoggle caption Richard Shiro/AP

Republican presidential candidate Herman Cain, seen here in Concord, N.H., earlier this month, is reassessing his campaign after denying allegations this week that he engaged in a long-term affair. Brian Snyder/Reuters /Landov hide caption

itoggle caption Brian Snyder/Reuters /Landov