app/views/special_user_groups/_special_user_group_assignment.html.erb
<%= div_for special_user_group_assignment do %>
<%= special_user_group_assignment.user %><%="-Principal" if special_user_group_assignment.is_principal? %>
<%=link_to_remote "Remove User", special_user_group_path(special_user_group_assignment), :method=>:delete %>
<% end %>