Google and Microsoft's bitter and long-standing rivalry in the Internet search and advertising markets is spilling over into Washington.
Senior executives from both companies are scheduled to show up before a U.S. Senate panel on Thursday afternoon to argue their respective cases for why Google should--or should not--be allowed to purchase DoubleClick for $3.1 billion. The acquisition was announced in April but is still undergoing a review by the Federal Trade Commission and by regulators in Europe and Australia

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