The driving force behind democratic norm erosion is polarization. Over the last 25 years, Republicans and Democrats have come to fear and loathe one another. In a 1960 survey, 4 percent of Democrats and 5 percent of Republicans said they would be displeased if their child married someone from the other party. Fifty years later, a survey found those numbers to be 33 percent and 49 percent, respectively. According to a 2016 Pew Survey, 49 percent of Republicans and 55 percent of Democrats said the other party makes them “afraid.” And a recent study by political scientists Danny Hayes and Liliana Mason shows that about 60 percent of both Democrats and Republicans said they believed the other party was a “serious threat to the United States.” We have not seen this kind of partisan hatred since the late 19th century.Some polarization is normal—even healthy—for democracy. But extreme polarization can kill it. As recent research by political scientist Milan W. Svolik shows, when societies are highly polarized, we become more willing to tolerate undemocratic behavior by our own side. When politics is so polarized that we view a victory by our partisan rivals as something that is catastrophic or beyond the pale, we begin to justify using extraordinary means—such as violence, election fraud, and coups—to prevent it. Nearly all the most prominent democratic breakdowns across history (from Spain and Germany in the 1930s to Chile in the 1970s to Thailand, Turkey, and Venezuela in the early 2000s) have occurred amid extreme polarization. Partisan rivals came to view one another as such an existential threat that they chose to subvert democracy rather than accept victory by the other side.
First dems have to get the WH, Senate and House. With all three in their control, I'll bet you my left lung that, yes, they will indeed get rid of the filibuster, electoral college, pack the supreme court, and add statehood to Puerto Rico and DC. Then the US will officially be ruled by one party, pretty much for generations to come.