From #NBCNews: Elon Musk's America PAC has backfired on him, as his "door-to-door" canvassers are not really knocking on doors, just faking canvas cards and submitting them so they get paid.
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"... canvassing insiders acknowledge that some level of fraud by canvassers takes place on virtually any effort in both parties."
We ran into this problem with a local recall back in 1995. Professional signature gatherers get paid by the signature, so they have the incentive to cheat. Although we turned in enough signatures, about 25%-30% of them turned out to be bogus.
https://www.latimes.com/archives/la-xpm-1995-10-29-me-62639-story.html
@WordsmithFL nods. I was around during the beginnings of paid canvassers and...I saw issues.