Thanks for you comment!
I did some checking and here's what I found out.
First, you can check out http://www.c-span.org/
I just visited the site, and there is a 37-minute clip about Bob Barr, the Libertarian Party's nominee.
They also have a lot of other clips that you can find by using their search engine.
The following URL should take you to a search query that yielded some good results for me when I tried it:
http://www.c-span.org/Search/basic.asp?BasicQueryText=liber tarian%20conventionhttp://www.lp.org is the Libertarian Party's website, which is of course a good resource for relevant information.
I hope this helps.
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