In the history of any nation there are high and low points. There are events and people that make the nation proud or, frankly, cause it shame and embarrassment. I, for years, felt one of our proudest moments was Ronald Wilson Reagan telling Gorbachev, ''Tear down this wall.'' I always thought the shame of slavery would forever be our low point. That was right up until Jimmy Carter took office in 1977 and again last week when he spewed his hate-filled venom against his country and its president in Der Spiegel magazine. Jimmy, you are a disgrace to our nation....