Rhode Island Senator Sheldon Whitehouse is endorsing Hillary Clinton in her run for president.  Whitehouse says he has known Clinton for years, saying she has always fought for the needs of middle class Americans.  He's urging Democrats to unite behind Clinton as they prepare for a tough battle with Republicans and their big money backers.  Whitehouse says the nation needs a president who will be a champion for everyday people, and he feels nobody will be better for the job than Clinton.