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

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.

I would love to be in the position where the role is challenging enough that I need three months to prepare for it and then six months to live the life of character.

It seems not to matter that we are at the brink of a war that may spread beyond Afghanistan and Iraq to Iran and Georgia and then where? To Syria? To North Korea? To China? That we in America are in economic doldrums and are seeing small businesses fold and houses reclaimed by banks and a smouldering panic that is palpable everywhere.

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

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."