The fans phoned in about baseball, basketball, even underwater hockey, but no one asked the burning question, "So, what's the morning line?" Pete Rose dialed up a new career last week as host of a nightly sports radio call-in show in West Palm Beach, Fla. " He has charisma like Frank Sinatra," says producer Jerry Gross, apparently complimenting Rose. Baseball's all-time hit man is an obvious smash. His show is going national this spring. You can bet on it.