The leaders of college Democrat and Republican organizations in the state are planning to square off next week in a debate at Brown University. The debate between Rebecca Mears, president of College Democrats of Rhode Island, and Justin Braga, chairman of the College Republican Federation of Rhode Island, is scheduled Tuesday at Brown’s Salomon Center for Teaching. Organizers said the debate will include discussion of issues including gun control, standardized testing, and poverty. It will be moderated by WPRI-TV’s Ted Nesi. The debate format is question and answer with the moderator and will allow for exchanges between the two leaders.