The EU

According to this article, the EU is going to pressure the US to accept visa-free entry to all member states of the EU; the article notes in passing that many nations are not up to the standards of visa-free entry in the US.

I can't imagine citizens of some nations, such as the thoroughly corrupt Romania, being visa-free members of the bloc.  The Western nations of the EU themselves are hesitant about citizens of some of the new member states traveling in their own countries.  Why should the US act any differently?

I imagine that in a quid pro quo, the Czechs and the Poles will likely be offered visa-free travel in exchange for agreeing to host sites for the US/NATO/Western Civilization Missile Defense System, but it's a nonstarter to believe that realistically the United States will treat every EU country the same, regardless of the mantra Brussels repeats (as much to convince itself as to convince others) that every nation in Europe is to be treated equally. 

The standards are relatively objective; meet them and join the club. If there are objective standards for the Schengen states (and there are, more or less) can be debated within Europe, standards can certainly be debated outside of Europe.