Nice column on American Exceptionalism over at First Things:
American Exceptionalism a concept I’ve always associated with Jay Lovestone (via Wikipedia),
When he returned to the US, Lovestone was forced to pay for his insubordination and was expelled from the party – ostensibly not for challenging Stalin, but for his support of Bukharin and the Right Opposition and for his theory of American exceptionalism, which held that capitalism was more secure in the United States and thus socialists should pursue different, more moderate strategies there than elsewhere in the world. That contradicted Stalin's views and the new Third Period policy of ultra-leftism promoted by the Comintern.
A left outlook that I think History’s shown Lovestone right, and explains the outlook of a good many Chicago leftists and the hopes they placed in Barak Obama.