Attended the 2004 and 2008 DNC conventions. I have no idea why 15,000 journalists show up to these things. I'm not anti-convention, anti-convention coverage, or anti-people going to the convention, but there's really no reason for local, national, and international organizations to spend that much money sending people to cover these things. It's just a cool kids club event.
In exchange for a bit of blogging for a publication last time around I scored an extra credential for Mrs. A. The "real journalist" sent by that publication was horrified, and said, basically, that some poor journalist really could have used that. Give me a break. Point camera at podium, gossip about which celebrities are there, and hit the bars early. There was no need for one more journalist to be there. There isn't any news.