agree. phd is a professional training for an academic career. job placement might be the most important factor we should take into account in considering a phd program. some well-known scholars can definitely derive up the ranking of a specific program, since the research quality weighs heavily in the ranking system. a good and responsible professor is supposed to spend more time on students' training and jobhunting. but I think job is a product of multiple causes. besides advisor's part, the student's performance, publication and subfield, the reputation of a given program in community of political scientists, market demand and budget constraint all play some role. maybe a longitudinal multivariate regression analysis can offer a better answer. the interesting thing there is a multicollinearity between publication and general reputation. according to a professor, importance of publication is negatively related to the reputation of a program, which means the better a program is, the less press for producing pulication a student is faced with. NRC's regression ranking is based on survey of faculties, who choose a score on 1-7 scale. And then, if we take an average of the highest and lowest rank for a program, we can get a result which should be closer to that done by usnews.