UPDATE (7/2): Bogus.
We hardly knew ye. I think Obama should keep using it, personally. It might catch on the way Kennedy set a no-hat trend for American men. Incidentally, it would be kind of cool if we still had the hat thing, but the main point I'm trying to make is that we should embrace change, know hope and fist jab to our heart's content.
Wikipedia is full of wonder on the subject (italics mine):
"Time magazine wonders if it evolved from the handshake and the high-five. They cite knuckle bumping in the 1970s with NBA player Baltimore Bullets guard Fred Carter. Others claim the Wonder Twins, minor characters in the 1970s Hanna-Barbera superhero cartoon Super Friends, who touched knuckles and cried "Wonder Twin powers, activate!" were the originators."
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