I assume that "sent a postcard/letter/email/fax" is intended for "contacted an elected official" rather than "participated in a GOTV postcarding campaign"? Dunno if you wanna combine GOTV postcarding with "did phone-banking or text-banking" or make it a separate ticky box, but GOTV postcarding has been my big civic engagement activity (in addition to calling/emailing my electeds) and I would support it being included in future polls.