NRA launches ad campaign attacking Michael Bloomberg – The National Rifle Association is taking the unusual step of launching a multimillion-dollar ad campaign designed to turn Michael Bloomberg into a political bogeyman in this year’s midterm elections, and beyond.  The group, which announced its plans Tuesday, will begin its efforts with a $500,000 TV ad buy attacking Bloomberg — one of the most vocal gun control advocates in the country — and not just on guns. It’s a new tactic for a group that typically focuses its political efforts on supporting or opposing candidates for office. Bloomberg, the former New York City mayor, is not running for anything.