My first impulse is to think Mrs. Obama was referring to herself as the first African-American FLOTUS in our nation’s history, suggesting that if she can stand there as that forever first, then the students themselves are limited only by their own determination.
Does it diminish the historical significance of her story if she wasn’t addressing a blacks-only group? It sounded like the speech was about breaking barriers and overcoming obstacles.
This is the best I can do. Not sure that it helps.
“I know you have everything it takes to succeed,” she said, speaking to
more than 8,000 high school seniors. “I know that you are me, and if I
can be standing here as your forever First Lady, then you can do
anything you put your mind to. So remember this moment when you’re out
there.”