There are reasons for exJWs to lean in either direction.
The religion is a deeply literalist fundamentalist one. So it is no surprise if exJWs are very right-leaning. At the same time, some exJWs may reject the religion so completely that it also helps shape their political views, which might have them lean left.
Another issue is that the WTS discourages advanced education and career paths. Many JWs are dependent on government aid and subsidies, which are often championed by the left. A JW may take offense at many liberal views on sex and science, but they find that liberals are more inclined to offer the social services that many JWs depend on.
If you are a JW long enough, I think you're more likely to take a hardcore political stance. It is a very all or nothing approach to how we view the world. That particular concept is what I rejected in order to eventually fade.