Is There a Difference Between a Buddha and a Buddhist?

This summer I was at a conference in Colorado called the Buddhist Geeks Conference. Every time Stephen got up to talk, those of us in the know were glued to the edge of our seat because he gave these series of talks about the future of Buddhism that were so incredible. He just was so even all the time. And when things went well, I was so happy. So I started to realize, oh, this could be a better practice for me. Is that when I feel elation, not to hold onto it so much? Why do I practice this so much with the negative emotions? But with the positive emotions, I need to do this better.