A crisis of legitimacy swept across American politics in the second decade of the 21st century. Many people had the general conviction that the old order was corrupt and incompetent. There was an inchoate desire for some radical transformation. This mood swept the Republican Party in 2016 as Donald Trump eviscerated the GOP establishment and it swept through the Democratic Party in 2020.
In the 2020 primary race Joe Biden stood as the candidate for linear change and Elizabeth Warren stood as the sharp break from the past. Biden was the front-runner, but fragile. Many of the strongest debate performers — Cory Booker, Amy Klobuchar, Pete Buttigieg and Michael Bennet — couldn’t get any traction because Biden occupied the moderate lane.