FIRST ON CNN : NRA state focus follows Senate rejection of tougher gun control proposal . Groups supporting more gun restrictions active on local level . Colorado Senate president faces petition drive . NEW : Gun rights groups are pushing for new laws in wake of the Florida school shooting, and a push to ban assault weapons is gaining steam across U.S. TL;DR NEW: The National Rifle Association says it
FIRST ON CNN : NRA state focus follows Senate rejection of tougher gun control proposal . Groups supporting more gun restrictions active on local level . Colorado Senate president faces petition drive . NEW : Legislator says key to understand that Colorado was `` ground zero '' for two tragedies .