Twenty-one top contributors to Senator Hillary Rodham Clinton’s presidential campaign sent a letter today to House Speaker Nancy Pelosi, essentially asking her to back off and keep out of the superdelegate fight.

“This dynamic primary season is not at an end,” the donors wrote in the letter. “Several states and millions of Democratic voters have not yet had a chance to cast their votes.”

The letter is the latest sign of a deepening rift inside the Democratic Party. The Clinton boosters were responding to comments Ms. Pelosi made 10 days ago on ABC News’ “This Week,” when she suggested it would be dangerous for the party if the superdelegates tried to take away the nomination from a candidate who had won the most pledged delegates. (And as of now, that is Senator Barack Obama.)

The letter carries an ominous tone, which stops just short of delivering a threat. The donors remind Ms. Pelosi that they are “strong supporters” of the Democratic Congressional Campaign Committee. (A quick check, at least, shows that at least some of letter-signers have not given to the D.C.C.C.)

“We therefore urge you to clarify your position on super-delegates and reflect in your comments a more open view to the optional independent actions of each of the delegates at the National Convention in August,” the letter stated.

We’ll no doubt be hearing more soon from the Speaker. Until then, here is a copy of the letter:

March 26, 2008

The Honorable Nancy Pelosi
Speaker of the US House of Representatives
Office of the Speaker
H-232, US Capitol
Washington, DC 20515

Dear Madame Speaker,

As Democrats, we have been heartened by the overwhelming response that our fellow Democrats have shown for our party’s candidates during this primary season. Each caucus and each primary has seen a record turnout of voters. But this dynamic primary season is not at an end. Several states and millions of Democratic voters have not yet had a chance to cast their votes.

We respect those voters and believe that they, like the voters in the states that have already participated, have a right to be heard. None of us should make declarative statements that diminish the importance of their voices and their votes. We are writing to say we believe your remarks on ABC News This Week on March 16th did just that.

During your appearance, you suggested super-delegates have an obligation to support the candidate who leads in the pledged delegate count as of June 3rd , whether that lead be by 500 delegates or 2. This is an untenable position that runs counter to the party’s intent in establishing super-delegates in 1984 as well as your own comments recorded in The Hill ten days earlier:

“I believe super-delegates have to use their own judgment and there will be many equities that they have to weigh when they make the decision. Their own belief and who they think will be the best president, who they think can win, how their own region voted, and their own responsibility.’”

Super-delegates, like all delegates, have an obligation to make an informed, individual decision about whom to support and who would be the party’s strongest nominee. Both campaigns agree that at the end of the primary contests neither will have enough pledged delegates to secure the nomination. In that situation, super-delegates must look to not one criterion but to the full panoply of factors that will help them assess who will be the party’s strongest nominee in the general election.

We have been strong supporters of the DCCC. We therefore urge you to clarify your position on super-delegates and reflect in your comments a more open view to the optional independent actions of each of the delegates at the National Convention in August. We appreciate your activities in support of the Democratic Party and your leadership role in the Party and hope you will be responsive to some of your major enthusiastic supporters.

Sincerely,

Marc Aronchick
Clarence Avant
Susie Tompkins Buell
Sim Farar
Robert L. Johnson
Chris Korge
Marc and Cathy Lasry
Hassan Nemazee
Alan and Susan Patricof
JB Pritzker
Amy Rao
Lynn Forester de Rothschild
Haim Saban
Bernard Schwartz
Stanley S. Shuman
Jay and Tracy Snyder
Maureen White and Steven Rattner