In 1995 The Cato Institute put their imprimatur on a paper that said each dollar of Archer Daniels Midland's ethanol profit cost the American taxpayer $30. This wasn't quite fair, as it ascribed all government subsidy costs to ADM's lobbying efforts.
Dwayne Andreas was a prodigious lobbyist. This from SourceWatch: "A Watergate-era investigation led to criminal charges that he had illegally contributed $100,000 to Humphrey's 1968 campaign for President, but Andreas was acquitted. And his $25,000 cash donation to President Richard M. Nixon's re-election bid in 1972 became a focus of Watergate inquiry into abuses surrounding unreported campaign money. According to an investigative memo uncovered in 1992 that quotes President Nixon's personal secretary Rosemary Woods, Andreas delivered $100,000 in $100 bills to the White House shortly before the 1972 election."
I've looked at love from both sides now.
Mr. Andreas' motivation was higher than just rent-seeking for ADM, The Washington Post noted in 1985 that "Andreas said he was raised in a religious tradition that called for 'tithing' 10 percent of personal income to the church. And, he adds, 'I consider politics to be just like the church.'"
A back-of-the-envelope calculation shows that the cost to the taxpayer for each dollar of ADM's ethanol profit is down to $2.85. The current round of subsidies are set to expire in 2010.