I was at JR's most excellent blog, A Keyboard and a .45, and found his take on this story from Fox News.
The 90% myth started with the ATF and now the Obamanation is perpetuating the myth for their own purposes, i.e. to soften the public's resolve on resisting further 2nd amendment incursions.
Please send this information to everyone you know if you want to have access to firearms or at least NOT prevent your neighbor having that access. This is truly a Pro-choice issue.