A simple one-question poll can be a powerful workhorse—and in this case, it generated a 34% email opt-in rate. Watt polled their audience on a timely topic, which then lead to a call to action: opt-in to receive email about a relevant upcoming event. Say “No, thanks,” and go directly to the poll results; answer “Yes!” and get routed to an opt-in collector and then to the poll results.