Obama credits his presidential campaign with creating a "parallel public financing system" built on a wave of modest donations from homemakers and high school teachers. Small givers, he said at a fundraiser this week But those with wealth and power also have played a critical role in creating Obama's record-breaking fundraising machine, and their generosity has earned them a prominent voice in shaping his campaign. Seventynine "bundlers," five of them billionaires, have tapped their personal networks to raise at least $200,000 each. They have helped the campaign recruit more than 27,000 donors to write checks for $2,300, the maximum allowed....