When does a gaffe become flat out lying?

For months we have heard about Barack Obama's gaffes.

My question is when do people finally stop calling them gaffes and start calling them lies?

Definition:

gaffe: A blatant mistake or misjudgment.

lie: Something meant to deceive or give a wrong impression.

Originally, when I heard the story of Obama's uncle liberating Auschwitz, I thought that it was no big deal. Yes, he did get the story wrong, but it was just a mistake.

Now, as it turns out, this was not the only "gaffe" made during that speech. He also made a "gaffe" about his grandfather's military service.

World Net Daily

During the Memorial Day speech in New Mexico, Obama suggested his grandfather, the late Stanley Dunham, engaged in combat. But the Democratic senator's autobiography says his grandfather never saw "real combat." Also, Army records apparently contradict Obama's claim his grandfather signed up the day after the Pearl Harbor attack.

Obviously, some of this stuff begins to fall under the definition of lying, and not a simple gaffe.

Once again the definition for lie: Something meant to deceive or give a wrong impression.

So, is Obama attempting to deceive or give the wrong impression?

You bet he is and it is not the first time! (i.e. Reverend Wright, NAFTA, Selma march, etc...)