The actual phrase "American exceptionalism" was originally coined by Soviet leader Joseph Stalin in 1929 as a critique of a revisionist faction of American communists who argued that the American political climate was unique, making it an 'exception' to certain elements of Marxist theory.
https://en.wikipedia.org wiki American_exceptionalism
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In 1929, Communist leader Jay Lovestone informed Stalin in Moscow that the American proletariat wasn't interested in revolution. Stalin responded by demanding that he end this "heresy of American exceptionalism." And just like that, this expression was born.
https://www.theatlantic.com/politics/archive/2012/03/how-joseph-stalin-invented-american-exceptionalism/254534/
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Bernie calls for class struggle revolution per Marx. It's what makes him Bern.
Obama acknowledged our exceptionalism, trending toward Alexis de Tocqueville, without going the Nationalist route like Gingrich
"During his travels in 1831, French writer Alexis de Tocqueville observed that America was an exceptional nation with a special role to play in human history,"