He also apparently had a pretty big role in the Heller case. From Wikipedia:
In the landmark case of District of Columbia v. Heller, Cruz assembled a coalition of thirty-one states in defense of the principle that the Second Amendment to the United States Constitution guarantees an individual right to keep and bear arms. Cruz also presented oral argument for the amici states in the companion case to Heller before the United States Court of Appeals for the District of Columbia Circuit.
It's very nice to know someone like him is on the Judiciary Committee. He made Feinstein look like a fool.
He asked if she would back a bill that specifically banned certain books, but allowed others that Congress deemed were acceptable. After some dodging, and after being pressed again, she said something like, "Well, of course I wouldnt." But then a bit later, she tried to use Child Pornography as an example of books that could be banned by congress. A pretty weak argument, if you ask me.
I don't know too much about Sen. Ted Cruz, but it appears he, and others like Rand Paul, are really starting to shake Congress up. It will be interesting to see what happens with them in the near future.