ALA Advocacy Resources
The American Library Association has created a new website to assist libraries with their advocacy efforts locally & nationally. You can find it here: http://www.ala.org/advocacy/getting-started Navigate to various sections with the lefthand sidebar on that page. Includes sections on banned books, literacy, privacy, and more, along with the basics of library advocacy.
You may also wish to Join ALA's grassroots network. By joining, grassroots network members not only become part of a national movement for libraries but also gain access to a variety of resources for increasing awareness and staying engaged year-round.