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I'm not sure what your link proves. Yes, we know the economy and Iraq are the top two issues in the current election - not one person here has argued otherwise. Your polls don't list potential SCOTUS nominations as a separate issue, nor do they break down voting statistics by party affiliation or lack thereof.
The past 10 elections took place in different times, with different administrations in office, and different issues at the forefront; thus they are of limited value in assessing what voters of any affiliation think important in 2008.
It's called logic...why not use it to prove your point?