We Vote because we are citizens. But we vote conscientiously because we are people of faith. Our consciences are formed through studying Scripture and the teachings of the Church, examination of the facts, and prayerful reflection. 

The Church is the body of Christ, who reigns as king over all Creation. Everything, including political life, belongs to Jesus Christ, and so participation in political life belongs to the mission of the Church. Our mandate is to ‘go into all the world and proclaim the good news to the whole creation’ (Mk 16:15). . . . Here, ‘the creation’ refers to every aspect of human life. . . ‘Nothing human can be alien to it.’Introductory Note

Learn more at https://www.usccb.org/offices/justice-and-peace/forming-consciences-faithful-citizenship