RAMALLAH, West Bank, Jan 10 (Reuters) - U.S. President George W. Bush said on Thurday he believes a peace treaty between Israel and the Palestinians will be signed before he leaves office in January 2009."I believe it's possible -- not only possible -- I believe it's going to happen, that there'll be a signed peace treaty by the time I leave office. That's what I believe," Bush said at a press conference in the West Bank city of Ramallah with Palestinian President Mahmoud Abbas."I am confident that with the proper help, the state of Palestine will emerge," Bush added.