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* Brexit not affecting sentiment (Adds economist comment, background)
* NRA sets news conference at hotel across from White House
* Biden-led group holds first White House meeting
* Two sides of gun-control issue have vast differences in resources
By David Ingram and Patricia Zengerle
WASHINGTON, Dec 20 One week after a school shooting that shocked Americans - with many of the 27 victims buried and time allowed for prayers and investigation - the National Rifle Association will dive in to the fierce national debate about gun control.
The largest U.S. gun rights lobby plans a well-coordinated public entrance to the conversation on how to prevent such tragedies, starting with a rare news conference on Friday at a hotel across the street from the White House.
NRA Chief Executive Wayne LaPierre and President David Keene will then appear on separate Sunday television talk shows for their first interviews since gunman Adam Lanza killed his mother, 20 young children and six adults in Newtown, Connecticut, last Friday.
Inside and outside the NRA, an organization with powerful ties to politicians in Washington, expectations are the group will offer condolences and condemn the killings but offer little in the way of compromise over gun laws.
The group kept largely quiet in the first days after the Connecticut shooting, citing "common decency" and the need to allow time for mourning, prayer and a full investigation of the facts. It broke its silence on Tuesday to say it wanted to contribute meaningfully to prevent another massacre and announced its plans for the Friday news conference.
"They will talk about how terrible the violence is, about helping the victims, about violence in society," said Robert Spitzer, a professor at the State University of New York at Cortland and author of "The Politics of Gun Control."
Spitzer said he did not expect the NRA media blitz to lay out specific plans because so many within the organization consider the right to own guns absolute.
"If they did, it would contradict the path they have been following for about the last 35 years," he said. "Much of their membership would declare war on their leaders."
One NRA board member, Houston lawyer Charles Cotton, said the NRA should not say much until it hears more from gun-control supporters like New York Mayor Michael Bloomberg.
"You can't say specifically what you want to do before you sit around a table and talk about it," Cotton told Reuters.
NRA board member Bob Barr, a former Georgia congressman, said he was skeptical any new law would make a difference.
"None of the laws that the gun control folks want to put into place would have prevented this shooting. I think that's where we all start from," he said. Even proposed bans on guns known as assault weapons would not cover all semi-automatic rifles, he said.
America's unique gun culture means there are hundreds of millions of firearms in the United States for hunting, self-defense and leisure, as well as illicit uses. No one knows how many guns there are because there is no national registry.
About 11,100 Americans died in gun-related killings during 2011, not including suicides, according to preliminary data from the U.S. Centers for Disease Control and Prevention.
There were 19,766 suicides by firearms in 2011, the CDC said.
The NRA uses political pressure against individual lawmakers in Congress and in state legislatures to press for loosening restrictions on gun sales and ownership while promoting hunting and gun sports.
Gun-control proponents have been pushing for tighter gun controls since the Newtown, Connecticut, school massacre, the fourth mass shooting in the United States this year.
President Barack Obama has vowed to present a detailed plan in January. On Thursday, Vice President Joe Biden held the first meeting of an interagency effort among Cabinet members and law enforcement officials.
"The president is absolutely committed to keeping the promise that he will act," said Biden, who authored a crime bill in 1994 that included a ban on some semiautomatic rifles that has since expired. "We have to take action," he said.
Democrats in Congress who favor gun control have called for quick votes on measures to ban assault weapons or high-capacity magazines, hoping that the slaying of the 6- and 7-year olds in Newtown might be enough to win over more lawmakers.
Lanza used a Bushmaster semiautomatic rifle, police said.
The NRA's power is partly due to its large and active membership, which reportedly has been growing rapidly since the Newtown shootings. NRA officials did not immediately comment, but Fox News, citing a source within the organization, said the group has been adding 8,000 new members a day.
FLOODING LAWMAKERS WITH CALLS
The NRA is frequently described as having 4 million members, although nonprofit groups are not required to disclose their membership or how they define the term.
At key moments, such as before votes in Congress, many of those members flood lawmakers' offices with calls - a tactic few organizations can pull off, and one that the NRA's opponents want to imitate.
Mark Glaze, director of Mayors Against Illegal Guns, a group co-led by Bloomberg, said his group orchestrated tens of thousands of calls that jammed White House phones on Wednesday.
"It's the kind of thing that makes a difference in public policy. It's the kind of thing the NRA does very well," Glaze said. "And that's the kind of movement that we have to build if we're going to make any kind of difference."
There is a vast difference in resources of the organizations lining up in the gun debate.
During 2011, the NRA spent $3.1 million on lobbying lawmakers and federal agencies, while all gun-control groups combined spent $280,000 - a ratio of 11-to-one - according to records the groups filed with Congress.
Some of the NRA's money goes to Washington lobbying and law firms not usually associated with gun rights. SNR Denton, for instance, represents not only the NRA but major insurance, food and pharmaceutical companies. Lobbyists there did not return calls.
On another measure, that of spending on political campaigns, gun-control organizations have been more competitive. Independence USA PAC, a vehicle for Bloomberg's personal fortune on issues including gun control, spent $8.2 million on the 2012 election, compared to the NRA's $18.9 million, according to the Center for Responsive Politics.
The Brady Campaign to Prevent Violence, named for President Ronald Reagan's press secretary James Brady who was injured in a 1981 assassination attempt on Reagan, spent $5,816 on the election, much lower than the $1.7 million it spent on the 2000 election, according to the center.
* Brexit not affecting sentiment (Adds economist comment, background)
LONDON, June 26 Emerging stocks touched two-week highs on Monday thanks to strong gains across Asia, a one percent oil price rise and a flat dollar, while Chinese mainland shares were boosted by encouraging comments from index provider MSCI.