Scratch that. I looked at the Deliverance [signup page code](https://github.com/silverorange/deliverance/blob/master/Deliverance/pages/DeliveranceSignupPage.php#L172-L206) again.

We're already smarter than I remember in terms of using the database to load a list of interests. I think we should update the db and queries above to have a default flag instead, and kill the above method.