"Here's the problem. Because John McCain proposes such an enormous tax cut for the rich, Barack Obama can counter with a plan that offers lower tax rates than McCain's to the vast majority of taxpayers, while still bringing in dramatically higher revenues. The current McCain answer to this dilemma is to try to mislead the public into thinking that Obama favors middle-class tax hikes. McCain could, as Lowry suggests, throw in sub larger middle-class tax cuts to out-bid Obama. But his current plans are already so ridiculously expensive that... well, I don't want to say he can't do it, but at some point it gets too ridiculous.

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(RealClearPOlitics)