Fourteen months into a campaign that has the feel of a movement, Sen. Barack Obama has collided with the gritty political traditions of Philadelphia, where ward bosses love their candidates, but also expect them to pay up. The dispute centers on the dispensing of "street money," a long-standing Philadelphia ritual in which candidates deliver cash to the city's Democratic operatives in return for getting out the vote. Flush with payments from well-funded campaigns, the ward leaders and Democratic Party bosses typically spread out the cash in the days before the election, handing $10, $20 and $50 bills to the foot...