I agree with you that it is questionable that Obama senior was the actual father. There is little physical resemblance between Obama Sr. and Obama Jr. Unless Obama’s mother was a total slut, it is doubtful she would have gotten pregnant at the age of 17 by a 25 year old married man with children from Kenya who she had just met in a Russian Friendship Club. It is not impossible but it raises questions.
However, I am not sure why you say that there is no evidence that Stanley Ann Dunham was the mother. Stanley Ann was in Seattle in August of 1961 with a young black baby that she said was hers and spoke of the father as being Obama Sr. and talked about Obama Sr. being a tribal leader in Kenya and that she would return to Kenya and be one of his wives.
I am open to any evidence that you have and would welcome any information that can help me learn more.
Ping.
Here are a couple of comments to get you started:
http://www.freerepublic.com/focus/news/2706885/posts?page=52#52
http://www.freerepublic.com/focus/news/2706885/posts?page=80#80
Then,
http://www.freerepublic.com/focus/bloggers/2702976/posts?page=446#446
http://www.freerepublic.com/focus/bloggers/2702976/posts?page=448#448
After reading # 448, read to the end of this thread. There is an astonishing amount of research in the thread, including a lot of new information.