The Warlord Class Feature Canny Leader grants a "+2 bonus to Insight checks and Perception checks" to you and allies within 10 squares.
Does this also apply to checks against Passive Perception and Passive Insight?
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From the compendium entry on Vision and Light:
If you aren’t actively searching an area, the DM determines whether you see hidden objects or creatures by using your passive Perception check.
So passives are checks, so yes, your Warlord grants you the bonus.