WASHINGTON — A fifth woman accused Roy S. Moore, the Republican Senate candidate in Alabama, on Monday of making sexual or romantic advances toward her when she was a teenager, as senior Republicans in Washington called for him to drop out of the race. The new accuser, Beverly Young Nelson, told a news conference in New York that Mr. Moore attacked her when she was 16 and he was a prosecutor in Etowah County, Ala. Ms. Nelson was represented at the news conference by Gloria Allred, a New York lawyer who has championed victims of sexual harassment. “I tried fighting...