That is partly, though, because the Ethics Commissioner is also responsible for the Prime Minister's Conflict of Interest and Post-Employment Code for ministers. He is responsible for the Prime Minister's code, that is, for ministers, parliamentary secretaries, and public office holders, as well as for the House of Commons code. The Senate Ethics Officer is only an officer of the Senate, because he is only responsible for the Senate.
On June 14th, 2006. See this statement in context.