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Rummy thinks the war is going splendidly:

"Any who say we are losing this war are wrong," Rumsfeld told congressional Democrats demanding answers about the future of U.S. troops in Iraq. "We are not."

Yet he's tried to resign twice:

Citing what he called "gross errors and mistakes" in the U.S. military campaign in Iraq, Senator Edward Kennedy (D-Mass.) asked Rumsfeld if it wasn't time for him to resign.
"I've offered my resignation to the president twice," Rumsfeld shot back, adding that President Bush decided not to accept it. "That's his call."

Nothing says success like "I Quit!"