Maybe it was because it was held in Las Vegas, where so many great prizefights have been held.But Tuesday night’s Republican presidential debate was easily the best yet.CNN and Wolf Blitzer did a good, fair-and-balanced job of staging and refereeing the nine-person fight card.Most of the time was spent discussing substantive issues like foreign policy and national security, not throwing personal low blows.No candidate was the clear winner. No one was the unanimous loser. No one dramatically moved up or down in the rankings.A day later it’s still No.