Two Senate Democrats yesterday said they may support an amendment to block U.S. EPA climate rules, increasing the odds of its success when the Senate Appropriations Committee votes Thursday on EPA's budget. The potential supporters of an appropriations rider are Sens. Ben Nelson (D-Neb.) and Byron Dorgan (D-N.D.), both of whom are co-sponsors of a bill from Sen. Jay Rockefeller (D-W.Va.) that would freeze EPA's ability to regulate emissions from stationary sources for two years.