If you care about substance, you know there's nothing "historic" about Hillary Clinton's candidacy. We've had plenty of arrogant, self-serving, gun grabbing, tax-and-spend liberals in the White House before, so she's nothing new. In fact, she's basically promising to continue all of her predecessor's failed policies. The only way you think her presidency would be historic is if you're utterly and completely obsessed with identity politics.
If you're a liberal who sees things only in terms of race, religion, and gender, then you're completely convinced that Hillary is the most important thing to happen in the grand pantheon of American politics.