Luck is a precious thing in politics.
To take a couple of examples among Canadian leaders, Justin Trudeau has had good luck, oodles of it, in his short career, while Robert Stanfield had none when he needed it most.
Let's start with Bob Stanfield, the man they called the "best prime minister Canada never had." Stanfield was the immensely popular Progressive Conservative premier of Nova Scotia. Folks in his province contended he could keep getting re-elected as long as he lived — and maybe for one election posthumously.