> Being governor of a state, especially a state with a very large economy that spans most sectors, a large and diverse population, and a very diverse geography gives direct experience in a large fraction of what a President does. All that is really missing is commanding a military and making agreements with foreign governments.

Well, except that governors make agreements with foreign governments [0] and command militaries [1].

[0] http://www.latimes.com/local/political/la-me-ln-climate-chan...

[1] https://en.m.wikipedia.org/wiki/California_Military_Departme...