Apparently this rule was already changed, post season games do not get shortened do to weather. Delayed, or suspended but never shortened.
The 2007 rule change provided that the game resumes where it stopped, whereas under the old rule it would have been declared a tie and begun anew. Selig's decision not to shorten the game was his alone, perhaps not authorized by the rules, and, in my opinion (I can't believe I'm saying this), correct.
I'm still not sure—at least in regard to some other posts—how this is some sort of nefarious plot to help Obama.