Mayor Michael Bloomberg comes under attack at National Rifle Association conference – Mayor Bloomberg may have been the most unpopular person at the nation’s largest gathering of gun nuts no Friday — and he wasn’t even there.  Members of the National Rifle Association, attending their annual bullet bash in St. Louis, took aim at Hizzoner on Friday for his bold campaign against illegal guns. They called him a bastard, told him to mind his business and challenged his credibility.  And those were just comments fit for print in the Daily News.