As badly damaged as it is, our system has survived Zero, and even if they do everything right, a GOP House, Senate, and President (particularly a lib like Mitt) will quickly alienate a significant swath of voters.
I'm sure fieldmarshaldj can jump in with the stats, but even when Republicans dominated from 1865-1912, large parts of the midwest swung back and forth, and elections were close.
Why is Sgt. Schultz so worried ? He should be happy with a Socialist like Willard. After him, there may never be a Republican President again.