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.

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.

One of the great things about the old days of television, 10 years ago, or 15 years ago, was that it was water cooler television. People would communally watch the same hour. People used to tell us all the time, we turn off the phones, we put the kids to bed and that one hour is uninterrupted. Then, the next day at the water cooler, they all talk about it.

I have to admit I've rarely been happier in my life. I have been absolutely thrilled to be back in New York and living a block from where I grew up. Just to be back in New York and, quite honestly, away from Hollywood has been an absolute thrill for me. I feel like I'm a real actor again.

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