This seems pretty common in "fédérations" (or similar systems.) I guess Californians and Texans can both vote for local politicians under the same party, but n

This seems pretty common in "fédérations" (or similar systems.) I guess Californians and Texans can both vote for local politicians under the same party, but nothing force the politicians to vote together once in Congress ? Also, I think as a bloc, the EU is not entirely ready yet for, say, French people to directly vote for non French people. But who knows. As for the balance of powers in the EU, it's far from perfect. But coming from France, who am I to judge ?