Former Secretary of State Colin Powell is declining to renew the endorsement he gave Barack Obama four years ago, when he called Mr. Obama “a transformational figure.”

Pressed in a network interview to say whether he’s backing Mr. Obama,Mr. Powell, a former chairman of the Joint Chiefs of Staff, demurred Tuesday.

Mr. Powell called presumptive Republican presidential nominee Mitt Romney a viable candidate and said he’s “still listening” to Republican proposals. Mr. Powell, who served under President George W. Bush, also said, “I don’t want to throw my weight behind someone” at this point in the campaign.

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