There is no purpose in asking people to walk the neighborhood to canvass for someone who would support the status quo.
The software allows users to make phone calls, register to vote, and canvass neighborhoods with a few simple instructions.
c.1500, from alternative spelling of canvas (n.) and probably meaning, originally, "to toss or sift in a canvas sheet," hence "to shake out, examine carefully" (1520s); "to solicit votes" (1550s). The spelling with a double -s- dates from 16c. Cf. Old French canabasser "to examine carefully," literally "to sift through canvas." Related: Canvassed; canvassing. As a noun related to this, attested from c.1600.