[bhupy]

> In order to send representatives to the European parliment, the EU requires that representatives be elected in fair elections

And the US Constitution requires that its member states have a republican (small r) form of government.

> Part of being a member state of the EU requires having access to some sort of public healthcare system

First of all, that's not even true; the only requirement is that the member states accept the European Health Insurance Card regardless of how the healthcare is financed (publicly or privately). The Netherlands, for instance, gets its healthcare primarily through private health insurance. An EU-like approach to healthcare in the US would be for the Federal government to establish a common standard that can apply across disparate health insurance systems that are implemented, funded, and administered by the States, but that's not really what the D party is selling (as far as I know).