For the downvoters, he's referring to this instance when (then) Senator Obama jokingly referenced bubble sort during this Google event: https://www.youtube.com/watch?v=koMpGeZpu4Q
It was one of the many viral moments during Obama's original campaign where he seemed cool and in touch.
Of course, being able to call out a sorting algorithm is the kind of thing that makes you very "cool and in touch" in the grander scheme of things, unlike, say, playing sports or lifting 500lbs.