Third parties are playing a huge role in Canadian politics as they have no limits on donations and can spend unlimited funds between elections.
http://www.elections.ca/content.aspx?section=pol&document=42ge&dir=thi/tie&lang=e
Third Party Advertising 101 for the Canadian Federal Election
http://canada2020.ca/
https://www.albertaoilmagazine.com/2016/10/great-green-election-machine/
http://nationalpost.com/news/politics/millions-in-foreign-funds-spent-in-2015-federal-election-to-defeat-harper-government-report-alleges
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