Bang for the buck on economic stimulus

See Firedoglake post here ("Sometimes Even John McCain Tells the Truth: 'Tax Cuts Don’t Stimulate the Economy'").

Where would McCain get the idea that tax cuts are not good stimulus? Possibly from his economic advisor Mark Zandi of Moody's, who put together this chart that you have no doubt by this point seen:

McCain is evidently one of the biggest behind-the-scenes obstructionists set on tanking the stimulus bill. Even he knows his tax cut fetishism is just so much noise.

(Moody's made a typo.)