The Princeton Prize in Race Relations will be expanded to consider high school students from 23 regions for the 2008-09 school year, the University announced Friday.Students from Denver, Detroit and Pittsburgh will now be eligible for the prize, which is granted by the Princeton Prize Committee to students who have demonstrated commitment to improving race relations within their schools and communities.?We want to reach out to every school, community group, church and faith-based institution in these regions,? Henry Von Kohorn ?66, chair and founder of the Princeton Prize Committee, said in an interview.The three new cities will join Atlanta, Baltimore, Boston, Chicago, Dallas, Houston, Los Angeles, Memphis, Miami, Nashville, New York City, Philadelphia, Princeton, Rochester, N.Y., San Francisco, Seattle, St.