Ability to govern is something positive? Why do you think people like Walker and Perry are weak on immigration? They are governators. Anyone who has served a full term or more as a Governor is out for me.
Successful Governors make the best presidents - and my first choice - I like Walker and Perry.
The last thing we need is another "trainee president". Everything looks easy to a person who has never tried it. The closest experience to leading the country is being a successful governor of a major state.