This excerpt taken from the C DEF 14A filed Jun 18, 2009.
A: If you are a holder of Public Preferred Depositary Shares and you wish to participate in the Exchange Offers, if you do not give your Tendering Voting Instruction or Tender Certification, as applicable, we will not accept any of your Public Preferred Depositary Shares for exchange, and you will remain a holder of Public Preferred Depositary Shares following the conclusion of the Exchange Offers. Because we need a majority of the outstanding shares of common stock and two-thirds of the outstanding Public Preferred Depositary Shares on the Record Date to approve each of the Dividend Blocker Amendment, the Director Amendment and the Retirement Amendment, and a majority of the common stock and a majority of the outstanding Public Preferred Depositary Shares and USG Preferred Stock on the Record Date, voting together as a class, to approve the Authorized Preferred Stock Increase, if you do not grant your proxy or Voting Instruction, it will have the effect of voting against the Public Preferred Stock Amendments.
If you are a beneficial owner, you must instruct your bank, broker, custodian or other nominee how to vote. Your bank, broker, custodian or other nominee does not have the discretion vote your shares on your behalf without your instructions. Failure to provide the record holder of your common stock or Public Preferred Depositary Shares with instructions on a matter, such that your bank, broker, custodian or other nominee is unable to grant a proxy or Voting Instruction on the matter, will be equivalent to a vote against the Public Preferred Stock Amendments.