Barack Obama

I'm no longer just a candidate. I'm the President. I know what it means to send young Americans into battle, for I have held in my arms the mothers and fathers of those who didn't return. I've shared the pain of families who've lost their homes, and the frustration of workers who've lost their jobs.

The closer I get to retirement, the more I feel it will be a huge change, a shock, because athletics has been the core of my whole life. I know I'll miss the feeling of running fast, the adrenaline rush, and hearing the crowd cheering me on.

Because of my Asian-ness, I couldn't be anonymous - what I said, what I ate, what I did at the weekend were startlingly different to what everyone else did. I was also a performer, quick and chameleon-like, good at accents, so that made me stand out.