I consider it to evolve somewhat, especially regarding completely new concepts and technologies. For example, I strongly believe that the Fourth Amendment applies to digital documents and records even though a perfectly strict "dictionary-literal" reading of "persons, papers, houses, and effects" would not include them - I think "papers" includes them even if the Founders were not explicitly thinking of information stored on spinning magnetic disks when they wrote it.
The constitution "evolving" against its own intent, like some claim with the second amendment, is more dubious to me.
This.
Poll
