Almost all of these methods revolve around short codes, which are short messages (HOPE was one of Obama's most used - UPDATE: a Short Code is the number you text to, such as 388873, where as the message, such as hope, is called the "trigger." Thanks to Dane for catching this oversight on my part) that supporters text to a designated number and are then automatically subscribed to your list. So, it is not just about gathering the data from your main website or on-the-ground signups, but also utilizing short codes in a variety of methods to gain signups: