A RESTLESS SPIRIT is taking hold of American gun owners. When I write about gun issues nowadays, many readers respond impatiently, "We already know our gun rights are threatened. Tell us what we can do about it!" I am reminded of something my former boss David Horowitz wrote. In one of the blacker moments of the 2000 election crisis, one of our Web sites received a query from a reader, asking how Republicans could stop Al Gore from stealing the presidency. Horowitz, a shrewd political strategist whose book The Art of Political War became a manual for the Bush campaign,...