A Serious Question About Benghazi-gate

What's this about now?

Let's posit for the moment that Susan Rice was lying on the Sunday talk shows as McCain et. al. seem to be implying. What does she ... or Hillary Clinton ... or President Obama ... or the United States stand to gain from doing that?

In other words, what exactly are they accusing her of lying for? Richard Nixon was lying to cover up a criminal act. Bill Clinton was guilty of lying to save himself from embarrassment. I don't get what Rice, etc., is accused of lying for. And if you can't explain that piece of it, if you can't outline for me what the motive is here, there's no scandal.

So, again, what's this about now?