This article about rankings (based on hiring of new faculty and placement records) is only up to 2002, but is food for thought--perhaps a much better ranking methodology: http://jhfowler.ucsd.edu/social_networks_in_political_science.pdf
Also, if you end up choosing Yale's MA program, you don't necessarily have to wait until your second year to re-apply--can you apply next December and see what happens--given that there's a huge stochastic component to the whole admissions process anyways. Good luck!