When normal people happen to "find" their own money, it might mean a twenty left in a winter coat, or discovering change beneath the sofa cushions. But if you're Charlie Rangel, it means doubling your net worth.

Earlier this month the Chairman of the tax-writing Ways and Means Committee "amended" his 2007 financial disclosure form—to the tune of more than a half-million dollars in previously unreported assets and income. That number may be as high as $780,000, because Congress's ethics rules only require the Members to report...