i imagine it is being tagged as a ‘bot posting. since it is a comment a line return then a link. They probably have associated the user with the site and determined programatically that they are ‘blog pimping’ in the comments. That being said it’s Yahoo’s tech they have the right and unsurprisingly do/will edit whatever they see fit.
Remember, I was alerted to this censorship by a third party who had her comments deleted whenever she posted comments with a link to TheObamaFile.com.
I never go to Yahoo.
You can easily prove or disprove this item's heading by trying it yourself.
Here's a link: http://theobamafile.com/_opinion/DNCFraud.htm
And here's Yahoo News http://news.yahoo.com/