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Some of it has to do with a Republican candidate who, with a straight face, can defend hundreds of billions of dollars in tax cuts (after initially opposing them), yet complain about $3 million in porkbarrell spending to study the DNA of bears.
McCain is pandering to the voters who could not explain (or understand) the difference between a million and a billion. These are pretty much the same people who still believe that Saddam was behind 9/11, and who also believe that Obama is a Muslim -- and that it matters.