Democrats choose Obama; Clinton joins in acclamation

Barack Obama, standing where no black has ever stood before, swept to the Democratic presidential nomination on Wednesday as thousands of national convention delegates cheered his improbable triumph. Former rival Hillary Rodham Clinton made it unanimous, the culmination of a painstaking agreement worked out between the two camps to present a unified front. Obama was across town as the delegates he won in the primaries of winter and spring sealed his victory. Aides left open the possibility that he would briefly visit the Pepsi Center to thank his supporters, a routine event at recent national conventions.