Brendan Nyhan compares:
[P]erceptions of Palin's qualifications are unprecedented among presidential/vice presidential nominees and major presidential contenders in recent years. From Joe Biden to George W. Bush, no one has been perceived as less qualified since Dan Quayle and Ross Perot. The Palin-Quayle parallel, which Jon Chait nailed soon after her nomination, is particularly striking. Each was a surprise VP pick who sparked initial enthusiasm but later became widely perceived as incompetent.