You can access a list of blogs maintained by the government at this link here. There do not appear to be any benefits-related blogs yet in the line-up.
See also this post here from the Biddleblog, a blog from the University of Pennsylvania Law School, which discusses the emergence of government blogs:
Governmental web sites are usually one of the first places people go for official government information. Few of us, however, know that government blogs exist as a possible source of information. It may surprise many to learn that the federal government maintains a web page entitled “Blogs from the U.S. Government,” which lists active and archived government blogs.While governments have been slow to embrace Web 2.0 technology, it has nevertheless begun to do so. . .
There are those who will seriously question the veracity, value and reliability of information found on government blogs, as indeed should be the case. Regardless, government blogs remain a potential resource which may provide invaluable information and insight.