Washington Mutual Savings Bank's chief, Kerry K. Killinger, was eating breakfast at a Seattle club recently when a stranger yelled: "I merged with Washington Mutual today."

It was music to Mr. Killinger's ears. The slogan "Merge with Washington Mutual" is the centerpiece of a two-month-old ad campaign that has touched a chord in a market shaken up by deals involving BankAmerica and KeyCorp.

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