Actually Mulroney's choice of Mila confounded some of his friends, who saw her potential political shortcomings. She was neither French nor English, but an immigrant teenager from the Serbian community in Montréal, and she hardly knew a soul outside the city. She did not even pretend to have any expertise in political matters....
...Eventually any doubts Mulroney had had about marriage and his choice of wife would disappear. Mila would prove to be an ideal domestic partner -- a superwife. Cheerful and well-balanced by nature, she had the emotional strength to lift him up in weak moments and gently bring him down when he flew too high. Equally important, she developed into a captivating public figure who could work a room better than her husband, which was saying a lot. Marrying her would ultimately stand out as the single best decision of his career.
John Sawatsky, Mulroney: The Politics of Ambition (Macfarlane Walter & Ross: 1991) pp. 245-247.