WASHINGTON, Nov. 6 — Visitors to Gay.com can sign up to find the perfect dating partner, advice on sex and how-to articles on same-sex marriage and parenting. Over the course of at least two days in August, they may well also have seen banner advertisements about the Republican presidential candidacy of Mitt Romney, the former Massachusetts governor, according to an analysis of campaign Web advertising provided by the Nielsen Online, AdRelevance, monitoring service. At least 32,000 times over those two days, users clicking on the site got a Romney ad like one saying “Mitt Romney for President — Join Team...
