Open Government and Political Violence

Lots of discussion in the wake of the Arizona shooting. What I've not seen is a whole lot of facts about political violence.  The closest I've seen is an assertion that threats against the President have increased since Obama assumed office.  Maybe the Obama administration should apply a little open government: put a running total of threats and assaults against the President, justices, Congresspeople, and federal employees on its data.gov.  It'd take a while to build up a baseline, but it'd give a reasonable basis for some discussions.