MY guess, Tom?!
It was MM's way of saying that if left on his own, Donny Boy would have probably gotten lost within the halls of Parliament there in Ottawa, and if the logistics of the visitations had been reversed.
Here's some personal Canadiana for you, Dargo: my parents took me to Ottawa when I was a baby in a stroller and, under those circumstances, they got lost in the Parliament building.
So who should come walking around the corner? John Diefenbaker, future PM of the country. He took mercy upon my parents' plight and spent ten minutes or so taking them on a brief tour of the place. According to Mom he patted me on my little future voter head, too. I was too busy drooling to notice at the time, I guess.
Now that's got to be a unique way for any Canadian to meet a future leader of his country.