You're right: the cultural center has shifted glacially to the left over time, with erratic jumps back to the right when the Republicans actually hold supermajo

You're right: the cultural center has shifted glacially to the left over time, with erratic jumps back to the right when the Republicans actually hold supermajority power, followed by further gradual leftward drift when they lose it. Though in an economic sense, yeah, my original point stands. And actually, it's strengthened in a way: how can we talk about the median voter theorem pushing the parties to the center if they spent the whole most recent party system both moving strongly to the right on economic issues while moving erratically but consistently to the left on social issues? That would mean there isn't even one center!