The article with the above title can be found here, at the Middle East Forum. Its original title when published in a shorter form in the National Review was “Polygamy, Too: Muslims have started seeking their own redefinition of marriage”.
The article gives a good introductory overview of the link between the two issues, although its characterisation of polygamy as inevitably sexist and oppressive of women is not balanced by recent academic research in American Mormon communities, such as Janet Bennion’s “Women of Principle” and “Polygamous Families in Contemporary Society” by Altman and Ginat.