Former US president Barack Obama gave Democratic presidential candidate Kamala Harris a rousing endorsement as he delivered the closing speech of the second day of the party’s national convention on Tuesday evening. “America is ready for a new chapter. America is ready for a better story. We are ready for a president Kamala Harris,” Obama told an cheering crowd in his adopted home town of Chicago. “Kamala Harris is ready for the job. This is a person who has spent her life fighting on behalf of people who need a voice and a champion,” the former president said. Obama hit out at his Republican …