<human>:  Why did Barack Obama win the gold medal in judo?
<bot>: Barack Obama won the gold medal in judo because he was the best judoka in the world. Judo is a combat sport that involves throwing and grappling techniques. Judoka train by throwing each other, and in the Olympics, judo competitors must throw their opponents to score points. The goal is to throw your opponent so that they fall on their back, and then you apply a pinning technique to force them to submit.