The federal tax on firearms & ammo has been fixed at 11% for well over a decade. Perhaps your state is taxing it more, but it has nothing to do with Obama. He has, however, been touted as the greatest gun salesman ever! Only due to the paranoia that the NRA tries to instill in all of us.
http://www.rawstory.com/rawreplay/20...t-to-ban-guns/
http://www.ttb.gov/tax_audit/atftaxes.shtml#Firearms