TED KENNEDY's nickname:
douchebag ? appropriate, but NO, sorry.
slimeball ? appropriate, but NO, sorry.

Answer: the "swimmer"

go to: en.wikipedia.org/wiki/Mary_Jo_Kopechne

MORE PEOPLE HAVE DIED IN TED KENNEDY'S CAR THAN
HAVE GONE BIRD HUNTING WITH DICK CHENEY

for more on "swimmer" go to http://en.wikipedia.org/wiki/Chappaquiddick_incident