PalinvsClinton

Nyhan compares Palin to Clinton and Quayle:

I've looked back through polls on possible presidential candidates at this stage in the election cycle, and it's difficult to locate an appropriate comparison for Palin. Besides Clinton, the best comparison might be to Dan Quayle, a former vice president with extremely high unfavorables who was widely perceived as not ready to be president. As a result (presumably), Quayle ultimately decided not to run in 1996 and ... dropped out of the field before Iowa in 2000.

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