I had been used to improvising and even in the audition I was feeling free to rearrange Aaron Sorkin words a little bit, as lovely as they were. I didn't find out until after I got the part how furious Aaron was at me for doing that. They said, "He was livid. He did everything in his power not to jump down your throat!" But I came to realise that Aaron was writing in metre and the rhythm of the language is very important.

Things happen to us and reaction is sometimes tough to measure.

Every role is challenging in its own way, but the most challenging roles are the ones that are badly written - then it's completely up to you to come up with something that is interesting to the story and myself as an actor.

I am one of the lucky ones; believe me, I haven't forgotten that.

I didn't expect NBC would be at all thrilled about me, because the year before the West Wing I had rejected a pilot at the last minute and got them very upset. I ended up not coming to the casting - in fact it happened four different times because I just wasn't convinced that I wanted to do television.

Playing a TV character for seven years is almost like when you do a play. You live, breathe, and everything else with that character 24-7 for six months or four months or whatever, and that gets very deep in your blood. When you do a TV character for seven years, that's a long time. It becomes a seminal era in your life.

My parents grew up in the Depression. Despite the success that they both had in their lives, there's a certain mentality that tells you to finish all the food that's on your plate and not wasting anything and appreciating what's on the table.