LinkWND has published a photo of Barack Obama Sr. at a University of Hawaii student party that he attended without his "wife", Ann Dunham; the photo clearly shows his left hand absent a wedding ring.
Barack Obama Sr. at party with University of Hawaii students in the early 1960s
WND also reported on a letter Barack Obama Sr. wrote from Hawaii to his political benefactor in Kenya, Tom Mboya, in May 1962, discussing his wife, but he does so without mentioning Ann Dunham, his Hawaiian bride and the mother of the president, Barack Obama Jr.
Toward the end of the 1962 letter, Obama wrote, "You know my wife is in Nairobi there and I would really appreciate any help you may give her."