The EPA announced it is not withdrawing "its plan for regulating mercury from coal-fired power plants" despite pressure from some Democrats and environmentalists to do so (but final rules delayed to 3/05)
http://www.nytimes.com/2004/04/30/politics/30MERC.html E.P.A. Will Not Withdraw Its Mercury Plan
By THE NEW YORK TIMES
Published: April 30, 2004
ASHINGTON, April 29 — Rebuffing pressure from Democrats and environmental groups, the Environmental Protection Agency announced on Thursday that it would not withdraw its plan for regulating mercury from coal-fired power plants.<snip>
Senator John Kerry, the presumptive Democratic presidential nominee, is among the 45 senators and 10 state attorneys general who have asked the agency to withdraw the proposal.
The proposal allows power plants to buy and sell the rights to emit mercury, with a target of reducing emissions 70 percent by 2018. Environmental groups argue that the Clean Air Act calls for strict plant-by-plant controls by 2007.