Gallup was threatened by a lawsuit by the 0bama Administration about the #’s the voting #’s they were publishing, so they were held in bad favor, and weren’t told about the epic fraud around the corner the other liberal pollsters were told about the fraud, so they compensated.
... or -- Occam's Razor -- the Republican party attempted to beat a doctrinaire Chicago liberal with a doctrinaire Massachusetts liberal, and suffered an entirely predictable (and predicted) electoral thumping, as a result.
Go right ahead and keep placing your faith in the revealed wisdom of Karl Rove and Dick Morris, however.
Hillary Clinton will certainly appreciate the GOP-e's continued blind, mulish insistence upon gainsaying brute reality, when she crushes Jebbie Bush and/or Chris Christie, come '16.