Greg Mankiw directs us to David Leonhardt's article on John McCain's chief economic advisor, Doug Holtz-Eakin. I've known Doug for a number of years and admired his scholarship and his policy work. It's got to be frustrating to be pushing the McCain economic agenda. From the article, here's the crux of the problem:
In all, federal taxes now equal about 19 percent of the nation’s economic output, which is in line with the historical average. But the costs of Medicare and Medicaid, on their current path, would require that number to rise to an unmanageable 30 percent, and beyond, in coming decades.
“We as a nation cannot tax our way out of this problem,” Mr. Holtz-Eakin says. “It’s just not an option.”

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