I go in to Warner Brothers to test and in the waiting area I saw Allison Janney sitting there, who I did not know but I was a big fan of. I said to myself, "Wait a second. These guys might know what they're doing if they're hiring her."

Families are like puzzles. They fit together in a certain way, and if one piece is missing, it throws everything off.

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.

There's a genetic memory that stays on your bones. What you experience when you're young, I think it stays with you.

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

If you go to the real West Wing in the White House it looks like a boring law office; there's really not a whole lot going on in series. The moulding is frayed, the carpet is a little dirty; it's not exciting.