GRAND OLD PARODIES

Not all the print and broadcast pilgrims to New Orleans--the GOP estimates between 12,000 and 15,000 will materialize next week--will be journalists. Some will be there for laughs. For instance, Fox Broadcasting’s syndicated “A Current Affair” program is sending master Reagan impressionist Jim Morris, who was also in Atlanta last month twitting the Democrats. Mark Russell, one of Washington’s favorite professional wags, also was in Atlanta, but on ABC’s “Good Morning, America.” He’ll be on the show again in New Orleans, again kidding a convention and its candidates. Russell jokingly grumbled to The Times that few in Atlanta credited him with his description of Dukakis as “Zorba the Clerk.” “They all helped themselves to that,” he says. “That’s called acquired-joke syndrome.”