Elizabeth Warren, the chair of the Congressional Oversight Panel charged with monitoring the bank bailout, appeared on MSNBC this morning to talk toxic assets. On Joe Scarborough's Morning Joe, Warren warned of the hard-to-price assets that are still lingering on many bank's balance sheets. "By and large, the toxic assets that brought us to this point are still on the books of the banks," she said. Warren, who's been leading the call of late to reconcile the shoddy assets weighing down the bank sector, warned of a looming commercial mortgage crisis.