AP Photo/John BazemorePresident Barack Obama will call Hillary Clinton the most qualified person ever to serve as president in his address to the Democratic National Convention on Wednesday night, according to excerpts released by the White House. Obama is set to focus on Clinton's experience and readiness for the job, a common theme he has sought to tout in contrast to Republican nominee Donald Trump. Obama will say: "You know, nothing truly prepares you for the demands of the Oval Office.