There are 7,383 legislators in this country’s state governments. None of them could tell Danica Roem what to expect when she became an elected Virginia delegate this January. No one had ever taken the oath of a state office as an openly transgender woman. Roem was one of a kind — but not for long. Among all the congratulations last winter, there were emails from other trans people, including a woman named Brianna Titone in Colorado. They were ready to follow her. It was the beginning of a journey that would result in the apparent election this week of three more transgender women to state legislatures, including Titone, a Democrat in Colorado’s House District 27 around Arvada. “I was thinking about running but I didn’t know if I could do it,” said Titone, 40.