I played around with this a bit last night (local time) with my blog.
the blogstreet URL gave me the same error about the rss feed being invalid. blogstreet did find the RSS feed and pulled the index.rss2 URL.
http://feedvalidator.org said the index.rss2 URL was valid but there was an issue with content:encoded containing bad characters.
http://rss.scripting.com said the index.rss2 URL was invalid because of the previously mentioned issue.
It looks like it's an issue with encoding of a cut and paste from a news article. see below for the text that scripting.com reports as the error...
"""largely circumvented the "normal channels" – the Coordinating Leadership Group """
The source view of <a href="
http://www.the-eleven.com/~tjlegg/seren ... html">this post</a> shows this:
"""had largely circumvented the "normal channels" – the Coordinating Leadership Group on Hong Kong"""
Possible encoding issues within rss for an em-dash?