Oh, wait, it's Philadelphia! From the L.A. Times:

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 soldiers and loyalists who make up the party's workforce.

It is all legal -- but Obama's people are telling the local bosses he won't pay.

That sets up a culture clash, pitting a candidate who promises to transform American politics against the realities of a local political system important to his presidential hopes. Pennsylvania holds its primary April 22.

Obama's posture confounds neighborhood political leaders sympathetic to his cause. They caution that if the senator from Illinois withholds money that gubernatorial, mayoral and presidential candidates have willingly paid out for decades, there could be defections to Sen. Hillary Rodham Clinton of New York. And the Clinton campaign, in contrast, will oblige in forking

Seems like a risk here for Obama -- especially since he has the money -- but if he doesn't pay up, I really don't think it hurts him that much. To the extent that "street money" makes a difference in Philly, it tends to be the races that no one's paying atttention to, like municipal judgeships, when a voters shows up at the polling place in blank-slate mode. I think most rank-and-file voters already know who they want for president. And I think the biggest fear of the Philly machine is this: That they get don't get paid and Obama wins anyway -- sending the "wrong" signal to future payers of street money.