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.

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.

I remember the day Richard Nixon won in 1968. That was a time that seemed certain to bring about long awaited seismic change in America. But events of tragic proportion took us on a turn. Bobby Kennedy and Martin Luther King, Jr. were suddenly dead.

My favourite British spots are any of the beautiful parks, especially on a sunny day such as this, after a long stretch of cold, cloudy and rainy days.

Listen - I like musicals. Even when they're bad, there's a couple of dancers I can watch.

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.

I've been very lucky not to have turned down too many roles that I've later regretted.