Photo Illustration by Elizabeth Brockway/The Daily Beast/GettyPay Dirt is a weekly foray into the pigpen of political funding. Subscribe here to get it in your inbox every Thursday.Government watchdogs have long accused the Federal Election Commission of failing in its mission to enforce laws regulating money in politics. Next week, however, those questions will come from members of Congress, when the FEC faces its first oversight hearing in years.Rep. Joe Morelle (D-NY), ranking member on the H