Sorry for this question. I am still learning.

Something that has always bothered me is how much u.s. politicians obsess over helping the middle class. Seems like the two major parties talk about it a lot. Why do they endlessly talk about helping the middle class, but never seem to acknowledge or focus on helping the (lower?) or poverty or proletariat class?

To me it sounds like the middle class by definition should be not be as in need as other classes that don't have as much? What's the purpose of this?

Edit: Thanks for all your responses. :)