The 20 Clinton-backing fat cats who vaguely threatened House Speaker Nancy Pelosi to change her tune on superdelegates lest their purses and pocketbooks slam shut have contributed almost "$24 million to Democratic candidates and committees over the last 10 years," according to the nonpartisan Center for Responsive Politics.
They've donated almost $554,000 to Sen. Hillary Clinton's Senate and presidential campaigns and her leadership PAC -- compared to less than a tenth of that, $52,200, for Sen. Barack Obama.
"To borrow from an investment firm's old ad campaign," says the Center, "when big donors talk, politicians listen."
UPDATE: ABC News' Political Director David Chalian reports that a Democratic operative unaffiliated with either campaign and familiar with the reaction to the letter among Members of Congress says, "Members of Congress - who are superdelegates - make up the Democratic Congressional Campaign Committee" or DCCC from which the donors seemed to be threatening to withhold funds.
"Threatening the DCCC is equal to threatening the superdelegates Sen. Hillary Clinton's trying to court. The Clinton donor letter will just push undeclared superdelegates in Congress leaning toward Obama to endorse him sooner. It also reinforces the narrative that she'll destroy the party to win."