I hope there’s still some room left under the Obama campaign’s bus: A Top Obama Fund-Raiser Had Ties to Failed Bank.

For the Pritzker family of Chicago, the 2001 collapse of subprime-mortgage lender Superior Bank was an embarrassing failure in a corner of their giant business empire.

Billionaire Penny Pritzker helped run Hinsdale, Ill.-based Superior, overseeing her family’s 50% ownership stake. She now serves as Barack Obama’s national campaign-finance chairwoman, which means her banking past could prove to be an embarrassment to her — and perhaps to the campaign.

Superior was seized in 2001 and later closed by federal regulators. Government investigators and consumer advocates have contended that Superior engaged in unsound financial activities and predatory lending practices. Ms. Pritzker, a longtime friend and supporter of Sen. Obama, served for a time as Superior’s chairman, and later sat on the board of its holding company.

Sen. Obama has long criticized predatory subprime mortgage lenders and urged strong actions against them.

In a prepared statement, the Obama campaign noted that Ms. Pritzker was never accused of wrongdoing by regulators in connection with Superior, and that her family agreed to pay $460 million to help defray the costs of Superior’s collapse.