Dopey David told a group of distinguished experts at the London School of Economics that the government's £20 billion splurge on public spending is "seriously flawed".
Insisting the measure will stifle economic growth, Mr Cameron argued that consumers and businesses will be reluctant to increase outgoings because they know a tax hike is just around the corner.
riverScrap.com wonders why, if the general public is so savvy at macro-economics, it pummelled head-first into a credit crunch by taking out 73 million credit cards and ratcheting up £1,455 billion of debt.
But Dopey David insists us Brits are on the ball, and we ain't buyin' into none of that spin from Brown. I mean, how much can someone who served as Chancellor for ten years really know about the economy?
"The knowledge that the debt has to be paid off is undermining people's confidence right now," Mr Cameron yelped.
"When you're making a decision about buying a house, employing extra staff or investing in a business, you think about the bigger picture and you think about the future," he told a room full of people who don't just talk about economics when it's politically expedient to do so.
Dopey David concluded: "We need to give people hope that our economy is being restored to the right, responsible path - not give them a temporary superficial giveaway that undermines hope."
The Conservative Party had enjoyed a colossal 28 percentage point lead over Labour in September, as the credit crunch sank its teeth into the economy. That has since tailed off to just four points.