The poster andthebeatgoeson nailed it.
The state has systematically destroyed support systems for poor people since the failure of the Great Society. Nixon, Reagan, Clinton, etc., have all labeled those systems socialist or presented them as being bogged down by druggies or fraudsters (mostly of black and brown skin, too).
The erosion of those systems has led to the current state where the working poor have just enough skin in the system that they choose to work two jobs rather than abandon the system and have the time to participate in rallies, but not enough skin in the system to have anything but an essentially subsistence lifestyle.
On that note, assuming that the working poor even get the chance to vote, they'll vote for the brand that generally seems to be for them, and they'll vote for the biggest names in that brand. This is why Bill Clinton, for example, is parroted as a great president for black folks in America; he played the sax on Arsenio, a popular show that the working poor would have seen him on, and some people heard Toni Morrison call him our "first black president" out of context and go with it. Does it matter that Clinton's actual policies only further harmed black America by doubling down on racist law enforcement policies or the elimination of social safety nets for the working (or unemployed) poor? No, and who the fuck has time to research it when you're going from your bottling plant job to your other job in the kitchen at McDonald's five or six days a week?