"I think Juan stopped short - he got halfway to the destination and got off the train. He is certainly an excellent writer and a good person, but I'm not a nationalist"

This quote by Clarence Thomas is most likely referring to Juan Williams, a journalist and political analyst. Thomas is praising Williams for his writing and character, but is not a nationalist. This recommends that Thomas thinks Williams has a good understanding of the concerns, however does not necessarily agree with his views. Thomas is indicating that Williams has stopped short of his destination, indicating he has actually not gone far enough in his views. Thomas is likely describing Williams' views on nationalism, which he may not agree with. Thomas is not a nationalist, and is likely suggesting that Williams should not be either. This quote is a testimony to Thomas' regard for Williams, in spite of their differing views.