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After Adam Lanza shot and killed 20 children and six adults at the Sandy Hook Elementary School in Newtown, Connecticut in 2012, activists may have thought that gun control at the federal level was a sure bet. But as the old saying goes, \\u201cthere\\u2019s strength in numbers,\\u201d and the size of National Rifle Association\\u2019s membership has long outnumbered that of America\\u2019s gun reform groups. Leslie Crutchfield, the executive director of Georgetown University\\u2019s Global Social Enterprise Initiative, says high membership numbers is a matter of strategy. It doesn\\u2019t matter if the message is pro-Second Amendment, pro-gay marriage or anti-smoking. Those who know how to play the game get results. We talk to Crutchfield, who outlines social movement strategy in her new book, \\xa0\\u201cHow Change Happens: Why Some Social Movements Succeed While Others Don\\u2019t.\\u201d