Would you like more information on a topic Dershowitz writes frequently about? Here is "The First Amendment Handbook," published by the Reporters Committee for Freedom of the Press.
Here, in etext, is the First Amendment to the U.S. Constitution.
Would you like to zero in on a particular issue that has caught your eye during your research about Dershowitz? This is the homepage of ACLU, which should provide you with many different starting points.
Still having trouble picking a topic? How about music censorship? This page, on a book called Bleep! Censoring Rock and Rap Music, should get you started. What can you learn about the book from the description? How do the readings, judging from their titles, differ from the ones found in your text? Do you think the book's worth checking out?