This pretty much sums up their predictive value.

Eight years ago, Gallup poll, 9/19-21/2003:

Wes Clark 22
Howard Dean 13
John Kerry 11
Dick Gephardt 11
Joe Lieberman 10

Four years ago, Gallup poll, 9/14-16/2007:

Hillary Clinton 47
Barack Obama 25
John Edwards11
….
Rudy Giuliani 30
Fred Thompson 22
John McCain 18
Mitt Romney 7
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