CNN Money reports that Sen. Tom Harkin (D-IA) has pulled the “Clunker Culling” proposal from the economic stimulus plan making its way through Congress. The provision would have provided up to $4,500 in tax credits for scrapping a used vehicle with under 18 mpg and replacing it with a new car. The bill would have cost taxpayers up to $16b, according to CNN, which notes that lack of support from Republicans doomed the bill. Why? Apparently, “the provision required that the [new] vehicle be assembled in the United States.” Who knows, maybe common sense even had anything to do with it. President Obama did not take a strong position on the Clunker provision according to the Detroit News, but he is vocally backing $2b in battery development spending and a $600m purchase of fuel-efficient cars for the government fleet.