Shortly after the death of John F. Kennedy, however, liberalism ceased being anti-communist. Instead it became anti-anti-communist.
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You are either young or naive. Liberalism was anti-anti-communist long before Kennedy's death.
"Liberalism was anti-anti-communist long before Kennedy's death."
That's probably true, and an important reason why JFK, a rabid anti-communist, was no liberal.
Prager's a good guy who gets it mostly right.