He does the names because he is mocking a lib on how they said it. The Rio Linda is for people who are not so bright and need explanation....he used to use another city, I forget which one....its just a way of clarifying....
Goes back to when Rush got his job on Sacramento and a near by town, Rio Linda, was about as backwards as any place oft lampooned in back woods of the South. He's now picking on Port St Lucie Fla for similar reasons
For a period of time after the 2000 elections, he substituted a county or town in Florida, where the voters claimed they accidentally voted for Pat Buchanan. But the people in Rio Linda were complaining because they were being replaced so he went back to using Rio Linda. I am a long time listener. Since 1990.