It appears that Karl Rove was indeed the person–or one of the people–who told one or more reporters that Joe Wilson’s wife worked in the CIA. This Newsweek story seems pretty definitive:
In a brief conversation with Rove, [TIme reporer Matthew] Cooper asked what to make of the flap over Wilson’s criticisms. NEWSWEEK obtained a copy of the e-mail that Cooper sent his bureau chief after speaking to Rove. (The e-mail was authenticated by a source intimately familiar with Time’s editorial handling of the Wilson story, but who has asked not to be identified because of the magazine’s corporate decision not to disclose its contents.) Cooper wrote that Rove offered him a “big warning” not to “get too far out on Wilson.” Rove told Cooper that Wilson’s trip had not been authorized by “DCIA”
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