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Obama's eloquent expression of exceptionalism in Selma

This past Saturday, President Obama spoke in Selma, Alabama, marking the 50th anniversary of "Bloody Sunday"—the assault by Alabama state troopers on marchers from Selma to Montgomery for equal voting rights for African Americans.

His speech is remarkable for many reasons, but one of the things I find really remarkable is that it ranks as a singular example of presidential exceptionalist rhetoric.