Please define what you mean by the "left".
One important thing to remember is that the terms " the left" and "lefties" in most profit driven media is synonymous with "everyone that I don't like".
As far as demographics go, uneducated is synonymous with "not educated" to the extent that in America "educated" entails a college degree and "not educated" means that someone doesn't have one.
I'd argue that America never had a labour party in any traditional sense. People like Nixon, Ford, Carter and Reagan bascially enshrined that in legislation; hence the reason why the middle class has been almost neatly surgically removed from the economy.
The underlying reason is R>G but as a rightie (which I assume that you are on the basis or your previous pejorative comments), you already knew that.