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While I agree that the pundits underestimate the American people, there is a deep strain of ignorance that goes through the voting population. How much that affects the outcome, I'm not sure.
But I have stood in line for primaries with people who thought they were voting in the general election. I have voted alongside people who never read newspapers, watch the news, talk about politics who nevertheless felt it was important to vote, even though they weren't sure who was running.
I also know that many, many people vote, ultimately, for the candidate that they like the best on a personal, emotional level. In this case, all candidates pass the likability test to some degree, which actually makes some voters look a little closer at the issues, but most people (including pundits) base their opinions on very superficial notions.