Sanders said it perfectly in his open letter after the election.
While the Democratic leadership defends the status quo, the American people are angry and want change. And they're right.
Today, while the very rich are doing phenomenally well, 60% of Americans live paycheck to paycheck and we have more income and wealth inequality than ever before. Unbelievably, real, inflation-accounted-for weekly wages for the average American worker are actually lower now than they were 50 years ago.
Democrats just didn't do enough to make people believe that their lives would change for the better from them. Continuing the status quo is not something they wanted to hear.
Funnily enough my only exposure to D&D was from Baldurs Gate 3. I'll take it as a compliment though.