The head of a leading gay rights advocacy group in New York has begun criticizing Senator Hillary Rodham Clinton's position on same-sex marriage and encouraging gays and lesbians to stop giving money to her re-election campaign. In a memorandum to board members, Alan Van Capelle, the executive director of the group, the Empire State Pride Agenda, said Mrs. Clinton was "a complete disappointment," taking issue with her opposition to same-sex marriage and her support for a proposed constitutional amendment to ban same-sex marriage known as the Defense of Marriage Act. In his memo, which was reported on Tuesday on the...