this.$ is undefined

gistfile1.js

(function(Group) {

    /*
    *
    * Models
    *
    */

    Group.Model = Backbone.Model.extend({

        urlRoot: "groups"

    });

    /*
    *
    * Collections
    *
    */

    /*
    *
    * Views
    *
    */

    Group.Views.GroupCondensedView = Backbone.Model.extend({
        events: {
            "click .group button.primary": "subscribe",
            "click .group button.dark": "unsubscribe"
        },

        subscribe: function() {

        },

        unsubscribe: function() {

        }

    });

    Group.Views.GroupListView = Backbone.Model.extend({
        el: $("#groups"),

        initialize: function() {
            groups = this.$(".group");
            $.each(groups, function(index, group) {
                $.noop();
            });
        }
    });

})(clusterflunk.module("group"));