Tim Walz, Kamala Harris's running mate, has formally accepted the Democratic vice-presidential nomination at the party convention in Chicago.<br /> <br />In a headline speech in Chicago, the running mate of Kamala Harris touted his small-town upbringing and career as a teacher and coach.<br /> <br />It came after Oprah Winfrey made a surprise appearance on stage, telling the raucous crowd to back Harris in November.<br /> <br />Former US President Bill Clinton, in his 12th consecutive convention speech, hailed Harris as "extraordinary" and took aim at Donald Trump who he said "creates chaos”.
