From the 2008 Campaign Trail:

I have seen for quite some time that although we won the Cold War -- and defeated the Soviet communist empire -- America is vulnerable to varying degrees of collectivism, wealth redistribution, "creeping socialism" (Ronald Reagan's phrase), class-warfare rhetoric, and generally milder, more palatable (but still dangerous) forms of disguised Marxism. Why? How? The answer is simple: The history and truth about communism is not taught by our educators.

That total failure to remind and understand means that Americans are painfully vulnerable to repeat mistakes that should have been forever tossed onto the ash-heap of history.