"Score one for Obama," wrote Greg Mankiw, a former chairman of President George W. Bush's Council of Economic Advisers. "In light of the side effects associated with driving ... gasoline taxes should be higher than they are, not lower."

Economists said that since refineries cannot increase their supply of gasoline in the space of a few summer months, lower prices will just boost demand and the benefits will flow to oil companies, not consumers.

"You are just going to push up the price of gas by almost the size of the tax cut," said Eric Toder, a senior fellow at the Urban-Brookings Tax Policy Center in Washington.

Obama threw out a great quote about the proposal yesterday; "This isn't an idea designed to get you through the summer, it's an idea designed to get them through an election."