Lawrence Martin, who literally wrote the book on presidents and prime ministers, previews tomorrow’s meeting.

The one area where our PM could be embarrassed today is on the Omar Khadr file. Mr. Obama has moved to close the Guantanamo Bay prison and return America to the norms of international law and human rights.

Mr. Harper has shamefully backed away from supporting the rights of a Canadian locked up in that dungeon; he has almost come across as pro-Gitmo. Understandably, therefore, his team has been pressing to keep this issue off the agenda. It will be left to Liberal Leader Michael Ignatieff to raise it in his brief session with the President.

What are the odds one of the four questions at tomorrow afternoon’s press conference is used to raise the subject of Mr. Khadr? 10-1? 100-1?