I received the following response:

We, too, feel that civil liberties are crucial, and by spreading knowledge, the Wikimedia Foundation strives to liberate minds. However, we cannot get involved in matters that do not directly affect our ability to spread such knowledge, as we need to keep an unbiased stance, both within our encyclopedias and in our interaction with society at large. Also, please be aware that Wikimedia is a global endeavour and the English version of Wikipedia is only one of many, and the United States is just of many countries where it is published. As a matter of fact, less than half of the contributions on Wikipedia originate in the US.