Did Loughner read Miller?
I have no idea.
Several people have suggested that the ravings of Jared Lee Loughner ("The government is implying mind control and brainwash on the people by controlling grammar"; "What's government if words don't have meaning?") may have been influenced by the ravings of David Wynn Miller ("I am the judge in 1988 who wrote the mathematical interface on all 5,000 languages proving that language is a linear equation in algebra certifying that all words have 900 definitions through this mathematical algebraic formula and over the course of the past 21 years have developed an accuracy level in the syntaxing of language sentence structure to prove the correct sentence structure communication syntax language is required in a court system"; "FOR THESE TRUTH-COMMUNICATIONS-CITIZEN'S-KNOWLEDGE OF THESE FACTS ARE WITH THESE CLAIMS OF THESE FACTS-AS-FACTS BY THESE SENTENCE-CONTRACTS."), mentioned about a year ago on LL ("All words have 900 definitions?", 1/29/2010).
I'm skeptical about this — so far I haven't seen any connection more specific than the fact that both relate to language and both are ravings; but I don't have a lot of patience for reading this sort of thing.