We've all known a kid who upon losing a board game would freak out, hurl the game across the room and storm off while shouting something like, "This game sucks anyway!" It's no surprise the Republicans are doing exactly that.
Set against this context, it is not unreasonable to ask if the polls could be wrong. But based on the evidence, it would be unreasonable to conclude that the polls are giving us a qualitatively incorrect impression of how the election is shaping up.
As we get closer to election day, you're going to hear more and more rumblings about "partisan voter screens" and faulty "party ID gaps." Dick Morris is already writing about it, so you know the rest of conservative fantasyland isn't too far behind. Ignore those arguments.