I might be wrong, but it is just possible that McCain was counting on those 4 governors to “verify” the border was secure in his new, improved 2008 “comprehensive immigration” plan, so that amnesty could proceed.
I’m sure McCain was looking for any support he could get, be it from Janet Napalitano or Señor Ricardo Perrista. I’m convinced that should Perrista actually become presidente, McCain will finally get his long sought after amnesty.