I thought Clamato was primarily a Mexican thing for Chelada (you can get pre-mixed Clamato and Budweiser in Mexico and Mexican areas in Chicago and other cities).
I thought you Canadians were better than that. shakes head
To the best of my recollection Clamato juice was created for the first time in Boston or New Jersey, but popularized via the Caesar in Calgary (like a Bloody Mary with Clamato instead of tomato).
Either way, it's a prevalent drink in Canada and difficult or impossible to find elsewhere.
I thought you Canadians were better than that. shakes head