One thing that jumped out at me is that they cite an increasing number of party members hating the other party. What they don't consider is that party membershi

One thing that jumped out at me is that they cite an increasing number of party members hating the other party. What they don't consider is that party membership for both parties has declined over the same time period, presumably leaving the most partisan in the parties. So it doesn't seem unlikely that the very premise of the work is inaccurate.