Political scientist Charles Murray has never backed away from controversy, but usually his opponents have been liberals. Friday, however, he managed to upset conservatives at the annual conference known as CPAC, where thousands of bewildered Republicans gathered to figure out the way forward after their party’s 2012 electoral defeat. Murray ditched his prepared remarks on “America Coming Apart” in favor of an impromptu admonition to fellow conservatives to accept the legalization of both gay marriage and abortion. Murray, who is currently a fellow at the American Enterprise Institute, is revered by many conservatives. (He considers himself a libertarian.) His 1984 book “Losing Ground,” which blamed social programs for worsening poverty, and his 1994 book, “The Bell Curve,” which ascribed lower I.Q. scores to some minorities, have been attacked by liberals but embraced as game-changers by many conservatives.