All 4 Uses

canvass
in
Up From Slavery: An Autobiography
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At the close of my school year in Washington I was very pleasantly surprised to receive, from a committee of three white people in Charleston, an invitation to canvass the state in the interests of that city.†
Chpt 6 *

canvass = get the opinions (of people) by asking specific questions; or solicit votes
She made a personal canvass among the white and coloured families in the town of Tuskegee, and got them to agree to give something, like a cake, a chicken, bread, or pies, that could be sold at the festival.†
Chpt 8
A canvass was also made among the people of both races for direct gifts of money, and most of those applied to gave small sums.†
Chpt 8
After the question had been canvassed for several days, the directors voted unanimously to ask me to deliver one of the opening-day addresses, and in a few days after that I received the official invitation.†
Chpt 13

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)