When oil and chemical baron David Koch took his seat among the throngs of Republican grassroots activists on the convention floor in Tampa this week, he was making a rare appearance on behalf of the small group of wealthy donors who are bankrolling a good portion of Mitt Romney's bid for president. For the past several days in Tampa, Koch has been the exception. Most of the deep-pocketed donors -- the ones fundraising consultants call "the whales" -- have spent the convention largely out of sight.

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