By Kyle Smith, Jun. 21, 2015, NYPost.com

Hillary Clinton knows she has more baggage than Newark Airport. She doesn’t care, because she is counting on two strong forces to carry her to victory: Demographics and the leftward turn in American culture.

She and the other Democrats suffer from cultural hubris, though. Their social justice wings always threaten to take them a little too close to the sun.

Even if all enemies are vanquished, the progressive wars can never be won. The Democrats will always find new hostile territory to invade, always creating a New Frontier.

Two weeks ago I wrote about a massive, silent cultural revolution in American attitudes: Since just the middle of the last decade, there has been a huge increase in support for gay marriage, legalized marijuana and single parenthood.