I discovered, thanks to Google, a sourced report,
"Google owns Blogspot and has blocked users of our privacy service from accessing Blogspot."
Per its site, cotse operates a service similar to secure tunnel and anonymizer. I have heard it is popular in China.
It is not hard to see why Google Blogspot would do this. In connection with Blogspot blocking in Ethiopia and Pakistan, several bloggers have noted that these proxy services provide a way around censorship, including posting. Google, in its never ending effort to support censoring governments, is blocking a path by which people could access and post information despite the blocks.
But what Google has done here goes beyond helping repressive foreign governments keep information from their own people. It is now censoring Americans, who are the primary users of these services, from accessing Blogspot who seek to preserve their privacy in reading blogs, like they do when they read a newspaper.
By blocking access to Americans, Google is not only inteferring with American's rights to privacy, it is violating the rights of Californians, Google's home state, where the State Constution explicitly declares a right of privacy of its citizens.