It is not well known in the U.S., and many Canadians living abroad prize a bartender who can mix a good Caesar.
History
The cocktail was invented by bartender Walter Chell at the Owl's Nest Bar in the Westin Hotel in Calgary, Alberta, Canada in 1969, to accompany the opening of a new restaurant. In its original form, it contained tomato juice and mashed clams; Clamato had only just been released (coincidentally) by the American Mott's company that very year, and was not yet widely known or available.
In the early 2000s, Mott's began marketing pre-mixed Caesars in 12-ounce bottles.
When someone says Caesar the first thing that might come to mind is a salad, or possibly and old dead Roman guy, but if you are in Canada you'll probably think cocktail.
It could be that it is a savory cocktail with nary a drop of sugar.
This may be a similar cocktail, but where the Bloody Mary is quiet and subdued, the Caesar is spicy and fun.