Not really about an endorsement of the two-party system. When you go to the gas pump and see a picture of biden's face with an I did that sticker, it's a pretty safe bet that the person who put that up is a Republican.
Likewise, when you see someone criticizing the Biden administration for things that county jails are doing, safe bet it's a Republican.
But apparently your definition of enlightened centerists includes people who know what the executive branch actually controls.
Biden doesn't have a gas price dial on his desk, and doesn't set visitation policies for county jails.
I'd love to see a source for that assertion.