While I distrust government as the next bunker-having gun nut (that's a term of affection by the way) I don't understand the Oregon Firearms Federation opposing proof of legal residency to get a drivers license.
A) You have to provide proof of legal residency to get a job; you have to have a job to buy firearms
B) Speaking of buying firearms, unless you buy private you also have to provide proof of legal residency
C) The number of people who choose not to have a SSN is so miniscule that I do not believe that it is a valid argument
D) You have always had to identify yourself to the state to get a drivers license, the extra step actually verifying that you are who you say you are does not constitute a "national ID" (something I oppose)
E) This requirement exists, in patchwork, in most states in America. This has not led to a "national ID"