from this Free Press article; hyperlinks mine.
Michigan's Attorney General's Office has warned Blue Cross Blue Shield of Michigan to immediately stop what it believes are deceptive business practices that make it difficult for seniors to buy supplemental Medicare policies.
In a letter Wednesday, Carol Isaacs, deputy attorney general, told Blue Cross general counsel Lisa DeMoss that the office has received more than a half dozen complaints that Blue Cross, the state's insurer of last resort, does not promote the policies. Instead, "Blue Cross and its agents have been fervently marketing" its costlier Medicare Advantage products, Isaacs said, in the letter.
A quick look at the Blue Cross Blue Shield of Michigan Medicare 2009 page shows prominent branding for the "Medicare Advantage" name; it's not clear at all to me which if any of the products there are which. There is no "Medigap" branding visible, or "supplemental Medicare" language in h1 bold type.
A useful tool though after some searching is a BCBSM search engine, buried deep somewhere inside the site, powered by Verity and searching across a variety of sites with precise control over the dates of the documents returned.