For those who are new to the scene, I'll just say this. The particular details of partisan politics (Republican, Democrat, Green, Libertarian, etc., etc.) are not relevant here. 24 is outside those normal categories. His actual political ideas are an incomprehensible mish-mash of vaguely leftist notions, but I think there's absolutely every reason to take what he said as a threat.
How credible is the threat? I don't know. But credible enough to take legal action, in my opinion.
--Jimbo