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Retired Gen. Colin Powell, once considered a potential running mate for Sen. John McCain (R-Ariz.), now may endorse his opponent, Sen. Barack Obama (D-Ill.), according to Republican sources. But an air of mystery surrounds Powell's planned live appearance Sunday on NBC's "Meet the Press," and no one is sure what he will say.
Powell’s unassailable national security credentials could sway voters who are vacillating about whether Obama is ready to be commander in chief, and his endorsement of the Illinois senator would make a national security emphasis by McCain in the election's closing days extremely difficult.