A woman and a black(mulatto) man seeking the highest office in the USA.
How many would have though it possible even 3 years ago?
I suggest not many.
I'm old enough to remember when Eisenhower sent the troops into Little Rock.
I'm old enough to remember telling my daughter (Obama's age) that if she got grades twice as good as her brothers, worked twice as hard as they did, she would probably earn half as much money.
Fair? Hell no, but the "glass ceiling" existed in corporate America in those days.
Things aren't perfect, but they are improving.
Regardless of how the election shakes out this November, we as a people will have demonstrated just how much tolerance we have learned, and how it has made us better for it.