As the U.S. Supreme Court on Wednesday considered the case of a Massachusetts homeowner battling his mortgage lender over a bankruptcy plan, several justices focused their attention on his unlikely ally: Bank of America Corp. Bank of America, one of the largest U.S. banks, filed a friend-of-the-court brief in support of Louis Bullard, who owes community bank Blue Hills Bancorp Inc $387,000 for the mortgage on a property in the town of Randolph.