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WASHINGTON In a rare show of bipartisan unity, the three presidential candidates lent their names to a newspaper ad Wednesday accusing the Sudanese government of genocide in the Darfur region and urging an end to the violence.

Democrats Barack Obama and Hillary Rodham Clinton joined Republican nominee-in-waiting John McCain in signing the ad in The New York Times headlined "GENOCIDE."

"We stand united and demand that the genocide and violence in Darfur be brought to an end," the ad says, followed by the candidates' signatures. The ad says the candidates also have pledged to seek an end to the violence in Darfur if elected.

It was paid for by the SaveDarfur Coalition, which describes itself on its Web site as an alliance of over 180 faith-based, advocacy and humanitarian organizations.