There are bright blue, just as there are bright red, states and districts. As a result, the blue team has extremists, just as the red team does. They do not behave the same way, however; AOC and Bernie Sanders are not MTG and Lauren Boebert. Why the difference?
Because the Democratic Party wants to use government to help people, while the GOP despises government and wants it to disappear. AOC and Bernie push their positions vigorously, but in the end, they will settle for half a loaf if it is the best they can do. GOP extremists, on the other hand, are rewarded with power and publicity when they wreck government, so they do it.
Hence, the likelihood of a lengthy government shutdown.