Mainly. Not "exclusively," mind you, but, "mainly."
The problem with that is the warrant criteria for terrorism cases and what is considered terrorism. Should I tape over my camera if I am part of a radical home schooling cell or raw milk faction?
...I believe we are witnessing the stage being set for the criminalization and elimination by force, of Conservative Americans who ally themselves with the TEA Party.
Obama began to prep the government itself for whom he will declare to be enemies of the state, in the April 2009 DHS Terror Assessment. That assessment, right after Obama took office classified Conservatives, veterans and other anti-tax, pro-Christian, anti-abortion groups as potential mass terrorists. In that assessment, not one mention of Islamic terrorism all classifications were of domestic Americans who would be allied with a conservative viewpoint.
From As Conservatives Are Called Terrorists Obama Outlines New Program To Fight Violent Extremism