If Bush is "dry," than people like Gore and Kerry must be "super-dry."
If Bush is "dry," then Gore and Kerry and most politicians must be turning stiff and starting to decompose.
Could the term "dry" mean something different in Canadian slang?
I see, upon re-reading the article, that it refers to Bush himself as dry. The word is not applied to his humor. You're right -- that is baffling.
"Could the term "dry" mean something different in Canadian slang?"
I looked up dry in my Liberal Canadian-American dictionary and it says "dry" means "moron" in Liberal Canadian, which is a dialect used by the elite in Canada. My Conservative Canadian-American dictionary says "dry" means "smart, witty, but tough".