Tony McQuail @tonymcquailgreenprogressive is a fairly active poster, and has his ActivityPub address listed on his NDP leadership website: https://tonymcquailgreenprogressive.ca
Tanille Johnston @votetanille is here too, but hasn't posted since December. There are social media links on her website https://tanille.ca but not her ActivityPub address.
Avi Lewis @avilewis has his ActivityPub address on his website too. https://lewisforleader.ca
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