Each election offers an opportunity for Catholics to put their faith into action ... Too often however politics becomes a contest of powerful interests, partisan attacks, sound bites and media hype. The Church calls for a different kind of political engagement that is shaped by moral convictions of a well-formed conscience, focused on the dignity of every human being, the pursuit of the common good and the protection of the weak and vulnerable.
The Church’s primary role in the political process is to address political and social questions by helping its members develop a well-formed conscience, providing guidance on the moral dimensions of public debates, and encouraging the faithful to carry out their responsibilities in political life.
from :Guidelines for Pastors and Parishes on Lobbying and Electioneering