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Fight on earmarks

From NBC's Domenico Montanaro
McCain goes after Obama where he's comfortable -- on earmarks.

Obama fights back to point out that it only accounts for only $18 billion. "Eliminating earmarks alone" aren't going to help middle class, he said. Obama went after him on taxes (more on that later), McCain defends businesses because they create jobs.

McCain said earmarks account for more than $18 billion.