"You have to have been a Republican to know how good it is to be a Democrat"

This quote by Jackie Kennedy is an amusing way of expressing her pleasure in being a Democrat. She is suggesting that the Republican Party is so bad that it takes being a Republican to genuinely value the Democratic Party. She is suggesting that the Democratic Party is the much better of the 2 major political parties in the United States. She is also indicating that the Republican Party is out of touch with the requirements of individuals and is refraining from doing enough to help the country. By stating this, she is highlighting the importance of the Democratic Party and its dedication to helping individuals. She is also emphasizing the significance of choosing the Democratic Party in order to ensure that the nation is in great hands.