Troubled OneUnited Bank in Boston didn't look much like a candidate for aid from the Treasury Department's bank bailout fund last fall. The Treasury had said it would give money only to healthy banks, to jump-start lending. But OneUnited had seen most of its capital evaporate. Moreover, it was under attack from its regulators for allegations of poor lending practices and executive-pay abuses, including owning a Porsche for its executives' use. Nonetheless, in December OneUnited got a $12 million injection from the Treasury's Troubled Asset Relief Program, or TARP. One apparent factor: the intercession of Rep. Barney Frank, the powerful...