The crowd cheers were defeaning at the endorsement speeches, but the media has tweaked....

[Iwasthere]

... the audio, or turned it down (discusting!). Listen to this and see for yourself: http://time-blog.com/real_clear_politics/2008/01/teddys_endorsement.html

[NoPasaran]

1. I can't listen right now (at work) but based on what you say

You're probably hearing a submix that just has the speaker's mic without all the ambient crowd noise... the same as the audio from the infamous "Dean scream" of four years ago. It's a mixed bag. On the one hand, you lose a lot of the sense of crowd reaction, but you can actually hear the speaker.