PHILADELPHIA — President Barack Obama painted an optimistic picture of America’s future in a rousing speech on Wednesday that offered full-hearted support to Hillary Clinton in her campaign to defeat Republican Donald Trump and become the first woman elected U.S. president.“There has never been a man or woman, not me, not Bill (Clinton) - nobody more qualified than Hillary Clinton to serve as president of the United States,” Obama said to cheers at the Democratic National Convention in Philadelphia.“Tonight, I ask you to do for Hillary Clinton what you did for me.