That would be a powerful fact in an argument I'm having with someone. Can you supply any more information? I can't find anything definitive by google.
Google blocks such information. A good place to start is:
http://www.texasdarlin.wordpress.com
http://www.atlassgrugs2000.typepad.com/atlas_shrugs/
Here is the source article on Free Republic:
Importance of the newly discovered Dunham/Obama Sr. Divorce decree in proving ineligibility
http://www.freerepublic.com/focus/f-news/2158064/posts
GOOD LUCK!!