Barack Obama took the opportunity to look moderate at his alma mater. He did so by agreeing with McCain that the ROTC should be allowed access to Columbia's campus.
I did think that Time magazine's managing editor, Rick Stengel, asked Obama an interesting question about National Service. President Clinton wanted to implement a NS program but was opposed by teachers' unions. Obama insisted that "times have changed since 1992." He thought it would be a great idea if there if retired mathematicians and scientists would volunteer time in classrooms. Last time I checked this is precisely something the teachers unions have opposed with respect to NS.
Other than that Obama vowed to "make government cool again." Yes, government will be the most popular thing since the Jonas Brothers and Miley Cyrus.