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He obviously was not happy about being there. As I understand it, he is a union supporter and member (it's hard to get clear information through the rumors, but he is supposedly a member of the writer's guild). The writer's guild was picketing his show. I'm guessing that he was forced back, but he didn't want to be there. He intelligently chose to focus on the strike, at least in part to deflect some of the pressure I'm sure he was feeling from union members and friends. Colbert is in a better position. His character is by definition not a strike supporter, so he had a wealth of anti-strike material to draw from while still obliquely supporting the striker's. I don't envy either of them. They have to deal with both personal ethical issues and the reality that they will probably suffer professionally as a result of working during a strike.
I really wish that the participants of this strike would make more of an effort to get together. I don't particularly care if television shows are being held up, but there are a lot of people suffering over what amounts to a "how much money can I keep" issue. This isn't the glory days of striking, when they were trying to get decent work hours and safe working conditions.