Freedom - I'd say freedom is a pretty much universally lipserviced American value, though when it comes down to it we appear chronically incapable of passing beyond rhetoric on this subject. Here's an interesting commentary on the issue: http://www.slate.com/id/2291847/ Basically, we always talk about how free America is - we seem to value that quality highly - yet when asked to make specific policies to enhance the freedom of the American people, our politicians routinely balk. Examples abound in the article and in recent political history: Patriot Act, all sorts of fancy shmancy warrant-less acquisition of electronic communication. Maybe politicians have recognized that we don't actually value our freedom as much as we value hearing the word freedom in the context of pro-American rhetoric.
Opportunity - If I had a dollar for every time a politician used the phrase "American Dream" I would have very many dollars, maybe even enough to run for office. So far as I can tell, the American Dream is basically about upward mobility. If not "Rags to Riches" then at least "Rags to House-Lawn-and-Cable-TV". Too bad we're not doing too well on that metric: https://docs.google.com/viewer?url=http%3A%2F%2Fwww.oecd.org%2Fdataoecd%2F2%2F7%2F45002641.pdf
I'm not really sure what we should do about this sort of nonsense, other than be more explicit about our goals, the relationships between our goals and proposed legislation, and the measured impact of enacted legislation upon those goals. Good luck getting any of that passed through our legal system.