The first lady represents someone who teaches/represents values and morals
Frankly, I think it is time we got away from the "public figure, role model" stuff, the First lady represents the wife of the President nothing more nothing less, since she really has no role in government, she can be whatever she wants and whatever floats the president's boat (or anything else).
And also frankly, I'm not looking for moral lessons from my elected leaders because I can't imagine anyone less qualified to give them!!!!!
Leave that to the parents, priests, imams, rabbis, reverands, gurus, or whatever.
A president's role is to run the government. Period.
I may be ugly. I may be an American. But don't call me an ugly American.