Was he a paid signature gatherer? I so, that's probably why. I used to live in a state that allowed them, and they're a pain. They get paid a buck or two for every signature, so there's massive incentive for fraud. There were some cases for initiatives in general elections where people would copy names and addresses straight out of the white pages, in order.
Plus any organization with enough money can hire a ton of them, so just before the cutoff date to turn in signatures you could hardly walk down the streets downtown without being hounded for your signature.