I don't really follow their views R.R., as in my part of the world Falwell and Robertson get a lot more airtime than Jackson or Sharpton. I always assumed they were more popular in New York, Philadelphia, Chicago, etc.
On the other hand, I actually knew people who went to Liberty University.
In my honest view, I don't think any of the four particularly lead to a salvific theology, but I didn't want to get into that.