Supporters of a controversial plan to use eminent domain to seize underwater mortgages from non-agency MBS pools, write down their balances, refinance them into the FHA program and repackage them for sale to other investors are facing fresh challenges. In California, where the eminent domain plan was first introduced, the Joint Powers Authority formed by the County of San Bernardino and two of its cities, Ontario and Fontana, announced that its next meeting, which was scheduled for Thursday, Oct. 25, 2012, had been cancelled. The only business before the JPA is...