Barack Obama has already cast his vote in the US presidential election, which doesn’t take place until November 8.<br /><br /> He used a visit to his home town of Chicago to go to the polls, leading by example after urging people to register and vote.<br /><br /> In jokey mood, he would not confirm who he did actually vote for.<br /><br /> But the president has previously endorsed his former secretary of state and Democratic candidate Hillary Clinton, warning against a Donald Trump presidency.<br />
