Princeton University tied Harvard University as the top-ranked National University in U.S. News & World Report’s 2012 rankings of Best Colleges [1], reports the Huffington Post. Last year, Harvard stood alone as the best ranked National University, a category that encompasses large, research-oriented schools. No changes took place at the very top of the rankings of National Liberal Arts Colleges—schools that emphasize undergraduate education and award at least half of their degrees in liberal arts fields—as Williams College [2] once again edged Amherst College [3] for the highest rank…