U.S. Roman Catholic bishops are issuing an election-year guide stressing a moral imperative to evaluate candidates according to their positions on marriage and abortion.

The bishops adopted the guide called "Faithful Citizenship" at their national assembly Tuesday in Baltimore. The document was approved overwhelmingly in a vote at the event.

The statement was especially watched for how much it reflected the priorities of Pope Francis, who was elected two years ago.

The guide addresses a broad range of issues, including protecting immigrants and the environment, fighting racism and poverty, and opposing the death penalty. However, the bishops said they consider opposition to gay marriage and abortion rights paramount in this presidential election season and beyond.

About one-quarter of U.S. voters are Catholic, but they don't vote in a bloc.

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