SortOrder seems to be tied into the constant contact API. I even tried to manually modify the sort order in the database for the widget, and yet the widget still defaults to no sort order at all, except for the sort order delivered by the constant contact API.
Bummer. After spending several hours trying to *finally* implement my Constant Contact signup form the way I wanted to implement it, I'm forced to back-off and NOT implement Constant Contact yet again.
sigh... I certainly can't devote the time to program my own WordPress plugin. But I can't display 5+ list options and not have it sorted properly. It just looks unprofessional and difficult to sort through for my customers.