The framers of the American Constitution harboured few illusions about human nature and that’s why they invested so much significance in the US supreme court, the ultimate check on executive and legislative power. Sandra Day O’Connor, who died days ago at age of 93, was the first woman to be appointed as a justice in this court. For 25 years, she was one of its most influential voices. HARDtalk travelled to Washington DC in 2006 to speak to her.