US mid-term elections 2010: Barack Obama implores Americans to 'keep on believing'

Even Barack Obama's old Senate seat in Illinois is under grave threat Photo: REUTERS

Mr Obama returned to Chicago, where 200,000 people in Grant Park cheered his historic victory on a balmy night two years earlier, to tell a crowd of 20,000 at Midway Plaisance Park that they needed to “keep on fighting” despite all the setbacks.