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Here's a selection of general materials helping Catholics to vote in an informed Catholic manner. Catholic Answers offers a free voting guide. See also the EWTN Voter Guide. Patrick Madrid and Envoy Magazine offer the same.
Pat Madrid also offers a free ten-minute non-partisan video talk on the pro-life issue. Priests for Life has made available helpful voting materials. See also National Right to Life's Political Action Committee web page. Canon915.Org (endorsed by the Catholic organization, American Life League) makes a close analysis of (mostly Democrat) pro-abort politicians' records.
General "Non-Partisan" Guides
Disclaimer: I didn't check these four latter sites out to see if there was any bias or not, so use your discretion. But they seem to mainly offer the candidates' positions and voting records.