There is this old joke: "The US has two parties: The conservatives, and the Republicans..."

People may be stupid, but not blind. They see that things are bad, and want change. The "old" Dems promise status quo, stability, business as usual, maybe even business like in the good ol' days. That is like the textbook definition of conservative. The MAGA people promise and deliver change. Sure, might not be good change. But it's change.