I like this definition of philosophy: the study of the fundamental nature of knowledge, reality, and existence, especially when considered as an academic discipline.
The first degree I earned was in philosophy. One of the key components of such study is the knowledge of any science that accompanies a certain area of inquiry. You can have the science without the philosophy but you cannot have the philosophy without the science. When we get into areas of theory then we begin the journey into the awesome world of philosophy that goes with any area worth contemplating.
Political is more than just politics. It is an area of social justification and societal interactions. I dabble in politics in my small home. Concepts like consensus or dictatorship come into play. The areas of a democratic communism come into play.
The beauty of philosophy in today's politics is amazing. "Ban all Muslims from coming into the USA" needs more than just knee jerk reaction. It requires a deeper look into the workings of man. Is it right to ban the thousands in order to protect the millions? Cool stuff. Deeper than slogans and motivating people to vote a certain way. But in our science we get to examine the political ramifications of such concepts. In our philosophy we get to examine the core basis for even contemplating such a concept. Why someone wins or loses in the political arena is first answered by science numbers. But the bottom line is "what motivates people" and why? Perhaps that is also sociology but it blends into philosophy and the lines become blurred.
Philosophy has no boundaries. I like that.