Yes, like many of the bad things in American politics, they both do it. Relevant podcast: America's hidden duopoly. https://freakonomics.com/podcast/americas-

Yes, like many of the bad things in American politics, they both do it. Relevant podcast: America's hidden duopoly. https://freakonomics.com/podcast/americas-hidden-duopoly_radio/ https://freakonomics.com/podcast/americas-hidden-duopoly_rad... Both the Democrat and Republican parties like the system as it stands, because it guarantees nobody else can join the table.