Pierre Treudeau Passed the "multicultural act" that spent millions on migrants to promote their own culture. "Magically", the nationalistic migrant communities switched their allegiance from conservative party to the liberal one once the handouts began. Even though (for example) the Italian community of the 20th century in Canada remained socially authoritarian.
He secured FOUR TERMS in office. Yes, 16 years of Treudeau and he is now hailed in the Canadian education system as some sort of national hero. When he himself openly "crapped" on Canadian culture in his speeches for the sake of justifying cultural Marxism. Its crazy really.
The job of a politician is strictly to win votes. Everything else is secondary. I don't necessarily agree with the second half of the statement, in that I don't think preventing assimilation wins votes. But ultimately politicians are wired to win elections at all costs no matter what the consequences are.