The call for more gun controls has been a familiar refrain following the Connecticut elementary school massacre, but a number of N.R.A. backed congressional Democrats and some Republicans have joined the chorus this time. Some opponents of the N.R.A. say this most recent tragedy could provide a true test of the powerful organization. Even conservative pundit Joe Scarborough has called for stricter rules and Wal-Mart removed a semiautomatic assault rifle similar to the one used in the incident from its Web site. In the wake of the shooting, Mayor Bloomberg unveiled a new campaign for stricter rules, and will send out 34 videos to each member of Congress, a number meant to symbolize how many gun victims are killed daily nationwide. Gov. Cuomo also called for stricter federal rules, although he said the stateâ€™s assault weapons ban should be tightened, too.