Rag refers to the mag or site or whatever it is of which you are evidently the owner/publisher/blogger. Sorry, rag is a common term for newspapers/blogs/etc - comes from rag paper used in the print industry.
I know exactly what a rag is. Furthermore, I am not the owner of this blog, the original poster is the owner. Finally, as I was simply pointing out, this is not a rag it is a well respected satire site that many of us continuous FReepers (those that visit this site daily and not just before each election) have come to enjoy.