Photo by Jack GouldRohrabacher, frothing in November.The way Scott Harper begins his story proves that he had correctly identified the speaker he was covering."U.S. Rep. Dana Rohrabacher was in a froth . . ." Anyone who has witnessed the Mouth That Rohrabachered whip up the party faithful at GOP election night shindigs over the years knows that froth oh so well. But Harper was not at a swanky Republican fiesta nor a pity party like the Nov. 3 morgue scene that found a supremely pissed-off Dana s