Probably the most important things to know about him are that he is a hard man and an Aggie. And, as I noted the other day, he and George W. Bush don't like each other. They are different kinds of Republican. Burka explains this.
Somebody will tell you Perry was once a Democrat. It's true but means nothing; at one time all conservatives in the South were Democrats. They were Democrats because Abe Lincoln was a Republican. Darn few are Democrats today.