from your link:
"She was a girl, and what I mean by that is she was only 17 and 18, just out of high school. And he brought her at different times. She mostly observed because she was a kid. Everybody there was pretty high-powered grad-student types."
On Feb. 2, 1961, against Madelyn's hopes, and against the desires of Obama's father back in Kenya, Ann and Obama hopped a plane to Maui and got married. No guests, not even family members, were there. Barack Hussein Obama Jr. was born six months later in Honolulu.
Ann dropped out of school to take care of him. Her husband finished his degree, graduating in June 1962, after three years in Hawai'i, as a Phi Beta Kappa straight-A student.
Then, before the month was out, he took off, leaving behind his still-teenage wife and child. He did not return for 10 years, and then only briefly.
leaves for mainland
A newspaper story on the day he left, June 22, said Obama planned a several-weeks grand tour of Mainland universities before he arrived at Harvard to study economics on a graduate faculty fellowship. The story did not mention that he had a wife and an infant son...
Obama snr had already left his wife and child in Kenya, there's the pattern. Obviously 'getting married' (if they did) meant nothing. There's no record of a marriage, maybe it was all a ruse to pacify Stanley Ann's parents?
There's a girl named Ann USA shown in this image from the period; but it doesn't look like Stanley Ann.
Ann USA is on the far right.