Some 501(c)'s are like you, they advocate certain policies etc, but not specific candidates. But where the line needs to be drawn is where they spend...
And for the record. The IRS has, since their inception created criteria for audits. There are still many different criteria that will get you flagged...
So the thrad title "Boston bombing suspects did not have valid handgun licenses", is ridiculous as it has nothing to do with obtaining guns LEGALLY....