Add the Leads object to the main navigation bar

It would be useful to have the Leads object as part of the main navigation bar for all users to be able to see. At the moment users can only view all leads if they have a Sales set and permission to view the sales workspace as another user, but our marketing team would find it useful to see the Leads they have generated and how they progressed (i.e. did they become qualified or not). Currently this is not possible so it would be good to have Leads as an object under the CRM dropdown.