I am an old, old friend of Aaron Sorkin's, who is the executive producer and writer. He had been talking about doing a political show for a long time and I had been interested in it for a long time. The moment I became available, he called me last year and asked me if I wanted to do it and then I just had to audition for the powers that be, and I got it.

I used to defend the West Wing show from the charge of sentimentality or wish-fulfilment, because I think if you do go into the Barack Obama White House you will find six or seven people around him who are true believers. We make these people climb this filthy rope and then we stand at the bottom and say, "Hey, your hands are dirty!" To show heroic, progressive, democratic politics at work was more than I ever expected.

Whatever you do, make sure you want to write more than you want to be a writer. Make sure you want to act more than you want to be an actor. That is what will sustain you.

I grew up in a family where the internalized understanding was that the kids were going to grow up into a better world. I worry, because I don't think my kids are going to have that. The world is very scary. The world would be scary without the choices the current administration made, but they just exacerbated it. And it ticks me off. I want my kids to have a good life.

You don't want to become one of those Hollywood idiots who is just blathering about anything

With the success of a show, you get an opportunity to call attention to things that you believe in.

We all go through life bristling at our external limitations, but the most difficult chains to break are inside us.