Investor's Business Daily -- 'Furor over oil-industry windfall puts GOP to the test'

In his letter to the American Petroleum Institute, Sen. Grassley, R-Iowa, effectively urged oil companies to tithe -- that is, set aside 10% of profits. "You have a responsibility to use these record profits to invest in more exploration, production and refining capacity to increase supply of petroleum products," his letter read.

Grassley's letter was a sign that Republicans are prepared to use "hardball tactics," said Bill Ahem, communications director for the Washington-based Tax Foundation.

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