@Matt Morley you can use the "voting" powerup to allow people to add a thumbs up when they have acknowledged a card, but you can't vote on assigned checklist items. If you wanted to, you could subtask instead of assigning checklist items:
Congratulations to @Laura Holton , our latest winner of Taco Tuesday! And thanks to @Kristjan Geir Mathiesen - Origo for sharing the picture of Taco having fun with his new friend...
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