Illinois Bishops on "Elections, Conscience, and the Responsibility to Vote"

...as Catholic citizens, we inform and form our consciences as citizens in accordance with the principles of Catholic social teaching. The first and most essential principle of our social teaching is the dignity of every human person and each one’s basic right to life from conception to natural death. Respect for human dignity is the basis for the fundamental right to life. This is a non-negotiable principle that is supported by our beliefs but is logically independent of our faith.
. . .
Catholics should always vote for that person most committed to being a public servant dedicated to the common good. This being said, it should be noted that any candidate who supports a public policy where part of humanity (such as the pre-born, the elderly, the handicapped, or the sick) is excluded from the protection of law and treated as if they were non-persons is gravely deficient in his or her view of the requirements of a just society.

The full statement from the Catholic Bishops of Illinois is available here (PDF).