Why are Democratic states called "blue states" and Republican states "red states"?

This mystery is worthy of another "National Treasure" movie. In fact, if you look closely at the face side of a $20 bill, the eagle on the left is blue and the number "20" in the lower right corner is red. A-ha!

OK, enough "hue"y. In fact, all language sleuths agree on one thing: The current color scheme grew out of election maps used by TV network ...

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