Thank You for Smoking was an awesome film! And it's the kind of part Aaron Eckhart nails, in fact, I find to imagine him being any different in real life. But a lot of other good actors make an appearance in this movie too.
It's a movie that manages to make you laugh at all the awful things big companies do to make money, yet it doesn't pretend to make things better than they are. It's a clever story and it plays with logic and truth on a very human level.
Also, it had some hilarious moments. I loved it!