Political Memo: Weiner’s Behavior Prompts a Question: Why Did He Do It?

Some suggested the indiscretions might be an addiction with neurological roots. Others theorized that Mr. Weiner, a Democratic candidate for mayor of New York, could be meeting sexual needs unsatisfied in a marriage. And still others said he might be driven by a combination of a mood disorder and feelings of inadequacy to seek reassurance about his masculinity from women he had never met.