All 3 Uses

canvass
in
Nineteen Minutes
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There were still students streaming out of Sterling High as teams of EMTs began canvassing the building to take care of the wounded.†
Chpt 1 *

canvassing = examining an issue, getting opinions by asking specific questions; and/or asking people for political support individually
Could his team be canvassing the school for survivors'and still be at risk themselves?†
Chpt 1
'Thanks,' he said to the guard, his eyes on Peter, who immediately canvassed the room, his gaze lighting on the only window.†
Chpt 1

canvassed = examined an issue, got opinions by asking specific questions; and/or asked people for political support individually

Definitions:

(1) (canvass as in: canvass the crowd)
examine an issue, get opinions by asking specific questions; and/or ask people for political support individually
(2) (meaning too rare to warrant focus)