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 def subscribe_lead(lead_id, subscribed_by = '')
    # avoid creating new subscription if one already exists
    unless self.sequence_subscriptions.find_by_lead_id(lead_id)
      if Lead.where(:id => lead_id, :deliverable => true) #6-14-2012 >-JM-<
        self.sequence_subscriptions.create(:lead_id => lead_id, :active => 1, :subscribed_by => subscribed_by)
      else
        self.sequence_subscriptions.destroy(:lead_id => lead_id) #6-14-2012 >-JM-<
      end
    end
  end