Former Alaska Senator and Democratic presidential hopeful Mike Gravel talks about his campaign fundraising, U.S. relations with Iran and details his personal and political background in the newest in a series of in-depth interviews with the 2008 presidential candidates.

Washington, D.C., with a struggling inner city school system, has seen nearly a decade-long experiment in charter schools -- publicly funded schools that are given more autonomy than their peers -- result in a mixed record of student performance.