[TheBattman]

Obama never referred to her by name, or even by psuedonym, but he describes her appearance, her voice, and her mannerisms in specific detail.

I see two likely scenarios:

#1 - Obama just lied because thats what he does. #2 - Cause the "girlfriend" was a dude. While I see either as a possibility, I figure it is probably #1.

[tobyhill]

The third possibility is that the “composite” is that the “girlfriend” was a combination of dudes and gals.

[glennaro]

While many politicians lie, Obama's pathological condition has taken lying in public to a stratospheric level.

Why he needs to lie about old girlfriends is subject to conjecture, but it's clear he lied:

-- Either he lied when he represented his book as an autobiography (i.e., a factual account that does not allow for "composite" characters); or,
-- He lied about having a girlfriend -- at least this girlfriend.

The guy is unbelievable. You literally cannot believe anything he says. (What a way to go through life!)