I’m not sure.
On the radio today, Rush mentioned that he had an email (he clarified it very carefully it was only an email and it was not verified) from someone he knew which said the passes came from MSNBC.
The Code Pink people have an interview over at Democracy Now (a left side blog) saying they got credentials from drunk Republicans and journalists (who knows what they define as a journalist, could be a lefty blogger) and also claim one of their group got in with no credentials at all.