From their webpage: (my italics)
While we have a special obligation to first responders, we are prepared to engage in any activities that will help us fulfill our mandate. We are currently funded by a special Congressional appropriation that directs us to conduct "research into the social and political causes and effects of terrorism and the development of technologies to counter biological, nuclear and chemical weapons of mass destruction as well as cyberterrorism..."
Presumably "engage in any activities" would include conducting loaded polls to try and show public support for the advancement of anti-terrorism measures in spite of any loss of freedom or potential for abuse that might be involved.
And, their 'mandate'?
First, and foremost - to secure funding;
i.e.: the uninterrupted flow of federal tax dollars with no strings attached, and no accountability.