Maybe this isn’t terribly relevant…

But anyways:

http://www.nytimes.com/interactive/2011/01/25/us/politics/state-of-the-union-words-used.html?hp

This kind of shows the shift in what concepts are considered important issues and how they are expressed. Or rather, how US presidents interpret what they believe the public wants to hear. So, it’s slightly relevant to this period when you think about public opinion on the whole range of issues prevalent during the sixties and what government leaders made of it. That being said, the Times thing does primarily focus on more current lexicon.