What do Second Amendment and states' rights fans think about feds latest gun memo?

As detailed in this new AP piece, which is headlined "ATF: Illegal to sell guns to med marijuana users," a new memo/letter from the feds restates the US Justice Department's view that gun dealers violate federal law if and when they sell a firearm to anyone who uses medical marijuana consistent with state law.  Here are excerpts from the AP report:

Federal law already makes it illegal for someone to possess a gun if he or she is "an unlawful user of, or addicted to" marijuana or other controlled substances. A Sept. 21 letter from the Bureau of Alcohol, Tobacco, Firearms and Explosives, issued in response to numerous inquiries from gun dealers, clarifies that medical marijuana patients are included in that definition....

"There are no exceptions in federal law for marijuana purportedly used for medicinal purposes, even if such use is sanctioned by state law," said the letter by Arthur Herbert [available here], the ATF's assistant director for enforcement programs and services....

The clash between state and federal drug laws has led to lawsuits and criminal cases in some of the 16 states that have legalized medical marijuana use. Officials in two Oregon counties have said they'll appeal to the U.S. Supreme Court after state judges said sheriffs couldn't deny concealed handgun licenses for medical marijuana patients.

The Oregon Court of Appeals and the Oregon Supreme Court said the state law that authorizes concealed handgun permits is separate from the federal law that outlaws gun possession by drug users, and the state gun law doesn't address medical marijuana use.

Federal authorities also raided dozens of medical marijuana operations across Montana this spring, chilling a once-booming pot industry and leading to sweeping changes in Montana law. The Department of Justice followed up with a warning letter to political leaders in many states that federal prosecutors will pursue marijuana distributors but not individual patients who are following state law....

Pro-marijuana and gun groups said the policy clarification amounts to rescinding the gun rights for the thousands of people licensed to use medical marijuana laws. And it appears to contradict a 2009 Department of Justice memo that said the Obama administration would not pursue prosecution of individual medical marijuana users who obey state laws.

Besides that, the government is putting an additional burden on gun dealers to police their customers, said Montana Shooting Sports Association Gary Marbut. "Their business is to be merchants, not to be cops. Unfortunately, the federal licensing scheme complicates that," Marbut said. "It sounds as if the (ATF) is expecting them to drift further into the cop role."

I would be very interested to hear what various Republican candidates for president would have to say on this issue, especially Rick Perry and Michele Bachmann given their vocal support for the Second Amendment and for states' rights.

A few related posts:

• "Medical marijuana users fight for gun rights"
• Oregon Supreme Court says federal law does not allow denial of local gun permits for state marijuana users
• Why the Second Amendment is not (and should never be?) "part of normal constitutional law"
• "The Standardless Second Amendment"
• Ninth Circuit rejects Second Amendment attack on criminalizing drug addict gun possession