BERKELEY - A new UC Berkeley think tank will research whether Proposition 209, the state ballot measure that ended affirmative action at California universities, could be challenged successfully in court. Run by the Boalt Hall law school, the Chief Justice Earl Warren Institute on Race, Ethnicity and Diversity will take on one of the most contentious issues in higher education: whether race should be used as a factor in college admissions. The institute, to be announced Monday, also will study a broad range of other subjects, including the upcoming reauthorization of the Voting Rights Act and civil rights in K-12...