I think the Canadian sense of humor is dryer than America's and juicier than Britain's. I think it's a cross between the two of them, really.
Certainly Nancy Reagan had an extraordinary effect on her husband. I'm truly not sure that, say, Laura Bush had that much effect on the Bush administration. She certainly, you know, seems to be a nice person who I think the public likes. But I can't really put my finger on any huge impact she's had.