Barack Obama becomes 45th African American to lead major party ticket . Delegates cry , cheer during historic night . Former President John McCain says Obama is ready to lead . CNN nominee Joe Biden slams African American Joe Biden , his long-time friend .
Barack Obama becomes first African American to lead major party ticket . Delegates cry , cheer during historic night . Former President Bill Clinton says Obama is ready to lead . VP nominee Joe Biden slams Republican John McCain , his long-time friend .