PARIS, Nov. 17 - In the search for explanations for the riots that have rocked France, some politicians and intellectuals are pointing to a novel one: polygamy. In an interview with RTL radio on Wednesday, Bernard Accoyer, the parliamentary leader of President Jacques Chirac's Gaullist party, the Union for a Popular Movement, called polygamy "certainly one of the causes, though not the only one" for France's worst unrest in four decades. He blamed the former Socialist government of Prime Minister Lionel Jospin for being "strangely lax" in enforcing the ban on polygamy. Pierre Cardo, a deputy in Parliament from Mr....