US Democratic presidential candidate Senator Barack Obama (D-IL) and New Mexico Gov. Bill Richardson during a rally in Portlandton

 
US Democratic presidential candidate Senator Barack Obama (D-IL) and New Mexico Gov. Bill Richardson during a rally in Portlandton
US Democratic presidential candidate Senator Barack Obama (D-IL) (L) speaks while New Mexico Gov. Bill Richardson listens during a rally in Portland, Oregon, March 21, 2008. Richardson endorsed Barack Obama's bid for the Democratic nomination for U.S. president, on Friday, in a big boost for the senator. REUTERS/Richard Clement (UNITED STATES) US PRESIDENTIAL CAMPAIGN 2008 (USA)