
So, given that I attend a Catholic institution (albeit, the Jesuits being more liberal than most denominations), I find it appropriate to share a perspective of one of Regis' religious studies professors.
I have Catholic friends who are both Democrats and Republicans--mostly because of issues centered on education, poverty, and abortion. For my democrat friends, they feel more compelled by Catholic social teaching, while my republican friends value the protection of life.
I find the question of "Can a Catholic be a democrat?" extremely important for students here at Regis, 60% of whom identify as Catholic.
Check out Professor Kane's commentary here.