Here's an insight into how he thinks. Money quote:
Like any other act of Congress, the Patriot Act should be scrutinized, criticized and, if necessary, amended. But in order to scrutinize and criticize it, it helps to read what is actually in it. It helps not to conduct the debate in terms that suggest it gives the government the power to investigate us based on what we read, or that people who work for the government actually have the inclination to do such a thing, not to mention the spare time.
He seems like a level-headed rule-of-law conservative to me.