New Jersey's well organized gay rights advocates are finding their adversaries are also getting prepared for a coming legislative debate over gay marriage. The National Organization for Marriage, established earlier this year in Princeton, made itself known over the past few weeks with radio advertisements urging people to call their lawmakers to tell them that allowing gay couples to marry would undermine the institution. The group set up in left-leaning New Jersey because it is one of a few states where there's a realistic chance in the next few years that lawmakers will vote to allow gay marriage. That makes...