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JOHNSTON, IOWA--Rep. Steve King, a champion of the federal ethanol mandate, tonight tore into an ethanol industry lobby group for its attacks on Ted Cruz, a mandate opponent whom King is nonetheless endorsing.

"Who are you really working for?" King asked of America's Renewable Future, an ethanol-industry-backed lobby group running vicious attack ads against Cruz in Iowa. "Who funds you?"

ARF is running a radio ad that says "politicians like Ted Cruz support subsidies for Big Oil, but want to end support for ethanol." The ad says Cruz opposes ethanol subsidies because of his personal investments in oil, "and the SuperPACs backing his campaign have received over $25 million from oil interests."

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