(FORTUNE Magazine) – President Bush has proposed that corn-based ethanol be mixed with gasoline to make a supposedly cleaner fuel for city use. The funny thing is that the Administration's own Environmental Protection Agency has found the mixture increases the chemicals that make for smog. But the President's recommendation must have delighted Archer-Daniels- Midland . If adopted, it could significantly increase the some $1 billion the company already gets from ethanol sales, mostly for use in gasohol, a blend offered at gas stations in the Midwest. Was Bush just saying thank you? A study by the Center for Responsive Politics, a nonpartisan research group, shows Archer-Daniels-Midland and its CEO, Dwayne O. Andreas, as the biggest financial supporters of the Republican Party. Together they gave the GOP just over $1 million between January 1991 and August of this year. White House deputy press secretary Judy Smith rejected any impropriety, saying, ''The President's ethanol decision was based $ on sound policy. Period.'' The company declined comment. Watch steel industry policy if Clinton wins. The Democrats' largest contributor is the United Steel Workers of America, which gave $393,000 over the same period.