A congressional panel has voted to subpoena former Sen. Jon Corzine to compel him to testify at a hearing next week about his role leading the investment firm MF Global, which collapsed after a disastrous bet on European debt.  House Agriculture Committee Chairman Rep. Frank Lucas, R-Okla., said Corzine hadn't yet confirmed that he would come and "his testimony is essential to fulfill our objectives." The move intensifies pressure on Corzine who has been largely absent from public view since he resigned as chief executive early last month. It would be a rare appearance by a former member of Congress asked to testify under oath about a matter under federal investigation in which he was involved. Regulators are investigating whether MF Global used money from customers' accounts for its own purposes as its financial condition worsened. An estimated $1.2 billion or more may be missing from customer accounts. A spokesman for Corzine and his lawyer, Andrew Levander, was not immediately available to comment. [AP]