The silence between Democratic presidential hopeful Barack Obama and Bill Clinton has been broken. Obama's campaign said two men spoke by telephone Monday. It was their first conversation since the Democratic primary campaign ended with Obama defeating the former president's wife. Obama spokesman Bill Burton said they had a "terrific conversation" and that the Illinois senator looks forward to seeing the former president on the campaign trail. Hillary Rodham Clinton has been helping Obama by encouraging her supporters to back his campaign. But Obama's relationship with Bill Clinton was more frosty after the former president was one of his harshest critics during the primary race.