"Those with talent for the difficult yet noble art of politics, or whose talents in this matter can be developed, should prepare themselves for it, and, forgetting their own convenience and material interests, they should engage in political activity."
From the Conciliar document, The Church in the Modern World.
The Church encourages our participation in politics, and we need a genuine Christian witness here especially. Sadly, the way the world is today, if you plan to enter into politics and remain uncompromising in being true to your faith, you might want to also have a second career option in mind. I say that not to discourage you, but just to remind you of how difficult it can be. The potential sinfulness in politics would be in allowing the prevailing culture to convince you to support something you know is wrong, such as abortion or euthanasia. May God bless you in this noble, challenging and necessary pursuit, or in whatever career you decide to pursue.