"Her supporters have recently argued with their checkbooks that superdelegates should vote their conscience at the Democratic National Convention in August.

"MoveOn's drive sets up a face-off that illustrates the widening gap in the Democratic Party between some of its traditional financial backers, many of whom support Clinton, and a Netroots donor base that leans toward Obama.

"Twenty of Clinton's major donors sent a letter to House Speaker Nancy Pelosi Wednesday that suggested they might rethink their support for the party's congressional efforts this cycle if Pelosi did not alter her publicly stated view that superdelegates should support the party's pledged delegate leader -- a position that would be fatal to Clinton's presidential bid." [...]

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