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In order to limit the power of the executive branch in Texas, the framers of the Constitution split the executive branch into several different
http://kut.org/post/why-lieutenant-governor-most-powerful-office-texas-and-who-wants-power
https://www.texastribune.org/2013/07/08/weak-governor-system-strong-governor/
https://www.texasobserver.org/who-runs-texas/