John McCain and Barack Obama are savvy politicians who have won numerous elections and stand poised to capture the biggest office of all. So obviously, each has a good ear for what will persuade voters and what won't. But even Pavarotti sometimes missed a high note. And lately both candidates have been noticeably off-key.

McCain's bad moment came after Obama expressed bewilderment at his opposition to a new GI Bill expanding educational benefits for veterans. Instead of explaining the ...

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