Canada election: can Trudeau excite young voters let down by broken promises?

Four years on, frustration and apathy could alienate young people in a campaign marked by sniping, absence of bold policy and the blackface scandal

In an election defined by mudslinging and racist dog-whistling, Justin Trudeau stood apart.

In a country weary of nearly a decade of Conservative rule, Canada's Liberal leader was a sunny optimist promising change. And his refusal to play dirty politics - in contrast to the veteran politicians he was facing off against - inspired young voters to come out in record numbers.