"While there are some positive provisions in the final measure, the lack of strong reforms is clear confirmation that Wall Street lobbyists and their allies in Washington continue to wield significant influence on the process," he said.
A spokesman for Cantwell said she was reviewing the final version of the bill and had not decided on her position.
Treasury Secretary Timothy F. Geithner, White House economic advisor Larry Summers and other administration officials were working Monday to help secure the final votes, a White House official said.
Sen. Charles E. Grassley (R- Iowa) is another potential target for the White House. Grassley supported the Republican attempt to block the Senate bill from a vote last month. But after that effort failed he voted for the bill's passage. His spokeswoman did not respond to a request for comment.
On climate change, Senate proposals would, among other things, limit greenhouse gas emissions such as those produced by coal-fired power plants. But it's unclear whether there are enough votes to block a Republican-led filibuster.
Though it is uncertain how Byrd would have voted on the latest climate change proposals, he broke with his fellow West Virginian, Democratic Sen. John D. Rockefeller IV, and voted to defeat a measure that would have blocked the Environmental Protection Agency from regulating global-warming pollution from coal-fired power plants.
Whomever the governor of coal-producing West Virginia appoints as Byrd's replacement could take a different view from his predecessor.
"Joe Manchin is very pro coal," said Roman Stauffer, a West Virginia Republican who writes a blog called West Virginia Red. "He's spoken out against the EPA action in West Virginia and how it's impacting coal mining jobs in the state."