Unions are evil?

Harvard Economist Richard Freeman dropped by the returning episode of Colbert Report yesterday, explaining why unions are good...

Here is part of the dialogue between Richard Freeman and Stephen Colbert:
...
- (RF) We've had the experience that in the last 30 years, unions have got weaker and weaker and weaker...
- (SC) Hasn't the market spoken? Isn't that just a free market speaking?
- (RF) Every survey that we have says that many more people want unions than ever before...
- (SC) Many more? Many more?
- (RF) Half the American people...
- (SC) Half?!
- (RF) Yes.
- (SC) Fifty percent?!
- (RF) Fifty percent.
- (SC) You can get fifty percent of Americans to say anything! (laughter) ... (ask the audience) Who wants to be a pirate? (Audience yelling...) That's a hundred percent of a RANDOM sampling of American out there...
...
- (SC) Do you yourself belong to a union?
- (RF) No.
- (SC) Thanks for stopping by.