I do not disagree with anything you wrote in this comment. My statement about empirical evidence was made in the context of policy discussion. When one politician consistently worked to implement some policy (for example, restricting illegal immigration) and another politician worked to sabotage it, the most plausible assumption is that they would stay on the same course during their next term in office. It is also possible that the politicians would radically change course and, in principle, one can make theories trying to predict such changes. However, in practice, people (myself included) are usually very bad at making such predictions.
I do not disagree with anything you wrote in this comment. My statement about empirical evidence was made in the context of policy discussion. When one politician consistently worked to implement some policy (for example, restricting illegal immigration) and another politician worked to sabotage it, the most plausible assumption is that they would stay on the same course during their next term in office. It is also possible that the politicians would radically change course and, in principle, one can make theories trying to predict such changes. However, in practice, people (myself included) are usually very bad at making such predictions.