Both LBJ and Martin Luther King Jr. have quotes that express that sentiment. I am really annoyed that I can't pull up the MLKjr quote (Its in a speech in a book called "A Call to Conscious".... I really wanted to go pull it from the shelves but due to our construction we no longer have a copy readily available in the library where I work).
But basically people like to have someone to look down upon. You might be scraping a the bottom of the barrel but "gosh darn it at least I'm not black, Muslim, asian, LGBTQ.... etc". And that type of elitist attitude is what attracts so many people that political party. I've met so many people that use the ACA, Food stamps, Section 8 vouchers etc that vote Republican....clearly not in their best interest? Why? You're living in a run down trailer in the middle of the woods, waiting on your stamps to hit the card.... but you're voting for Trump because he speaks his mind?
I don't have a problem with being a Republican. My father is black and votes Republican (albeit not in this election...considering). If I weren't so socially liberal and conscious I could vote republican without batting an eye for the right candidate. What I have a problem with is not voting in your best interests...and just voting because you think "this" is how you should vote because of "this".