That's a potent quote o' tehday, there at the bottom:
Katherine J. Cramer, a political scientist who studies populism, as quoted in a Washington Monthly article by Lee Drutman, also a political scientist:
“My fear is that democracy will always tend toward a politics of resentment, in which savvy politicians figure out ways to amass coalitions by tapping into our deepest and most salient social divides: race, class, culture, and place.”
Obviously politicians aren't the only ones doing this, but they might be doing it in the most important playing field, and one that should (ideally) be the "most free" from ideological contamination.
Cool article, by the way. Research works, sometimes.