Obama, Romney, Clinton and Bush -- or not: Great presidential impersonators on TV

Obama, Romney, Clinton and Bush -- or not: Great presidential impersonators on TV: Aykroyd played Nixon and John Belushi stood in for Henry Kissinger on Saturday Night Live back in the 1970s.

(NBC)

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Dan Aykroyd as Richard Nixon

Aykroyd played Nixon and John Belushi stood in for Henry Kissinger on "Saturday Night Live" back in the 1970s.