NRA gives Bloomberg snow blow — The National Rifle Association opened both barrels on Mayor Bloomberg yesterday, comparing his efforts to rein in gun violence to the city’s botched response to last month’s blizzard. A top official for the powerful gun-rights group told a crowd of sportsmen that Bloomberg — whom he repeatedly derided as “Mayor Blame” — was attempting to deflect responsibility for local gun crimes, just as he did when the city’s unplowed streets left New Yorkers fuming. “He likes to blame everyone else for violent crime in New York City,” NRA political director Chuck Cunningham said. “He’s also blamed Mother Nature for his recent problems with snow removal.”