Catholics on FR may have some observations on this.
Linda Chavez: Obama’s Catholic problem
Catholic Voters and 2008
Barack Obama Supports the Murder of Newborn Infants
Obama Lied About Abortion Record
What Barack Obama defended three times: Live Birth Abortion
[OPEN] Supreme K of C Calls for Real "Change" on Abortion and Catholic Revolt against Obama Nation
Obama's Catholic Problem ( Linda Chavez )
Obama’s View on Abortion May Divide Catholics ( "May Divide?" )
Obama loses 26 points among Catholics
Barack Obama's Wife Michelle to Join Hillary Clinton at Pro-Abortion Dinner
OPINION: Senator Obama and the Wall of the Womb
Barack Obama's Pledge to Overturn Every Pro-Life Abortion Law One Year Old
Obama Worse than Clintons on Abortion Says National Right to Life Leader Interview-SCOTUS Critical
Roman Catholics for Obama '08
OBAMA TO CATHOLICS: NO VOUCHERS
How can Catholics for Obama rationalize their support for the pro-choice candidate?
Obama’s director of Catholic Outreach ‘dodges’ opportunity to reach Catholics
Barack Obama Slams John McCain For Opposing Abortion, Activist Judges
Catholics and Obama
COMMENTARY: Quandry for Catholics At Election Time
The Latest Refinement (Obama on Abortion)
CNN Runs Biased News Story Covering Up Barack Obama’s Pro-Abortion Record
Jill Stanek: Obama's biggest lie about supporting infanticide
The Battle for Catholic Voters
New Report Indicates Voters Most Interested in Barack Obama’s Position on Abortion
Deal Hudson: Obama and Infanticide?
Ad asks Obama: ‘If fatherhood begins at conception, when does life begin?’
Embryonic stem-cell research immoral, unnecessary, bishops say
Catholics should not vote for Obama
Catholic Caucus: It is a sin to vote/support Obama/DNC [abortion]
More Catholics leaning towards Democrats, poll reports (really not Catholics)
The Catholic-Obama Problem (Pope Benedict XVI instructs Catholics about pro-abortion candidates)
Obama's Abortion Bombshell: Unrestricted Abortion....
NARAL Catholics Line Up for Obama
Editorial: Disagreeing with Doug Kmiec One More Time
State-Funded Embryo Research "Makes Taxpayers Complicit in Killing", say Bishops
McCain Meets Privately with Fr. Pavone - Says Constitutional Right to Life Applies to Unborn
Faithful Citizenship: “Catholic Vote” is very sought after
Has Obama dissolved his Catholic advisory council?
Commentary: Faithful Citizenship and the Formed Conscience
Catholic League: Where's Obama's 'Catholic Advisory Council'? [Not to be found!]
Right-wing Christians beginning to lean left (Misleading headline)
Catholics Debate Obama Vote
US Bishops Urge Voters to Give Priority to Life [Ecumenical]
Corralling the Catholic vote: Political necessity or pipe dream?
DOUG KMIEC: Catholic Reasons for Hope in the General Election
EDITORIAL: Why This Catholic Dreads the Campaign
The Catholic-Obama Problem (Pope Benedict XVI instructs Catholics about pro-abortion candidates)
Thoughts On ‘Roman Catholics For Obama’
How Obama's Catholics Will Dodge the Infanticide Question
Catholic Pro-Life Leader Feuds With Barack Obama's "Catholic" Backers
McCain and the Pope: McCain cannot win in November without the Catholic vote (Reagan re-visited?)
Catholics Cannot Vote for Pols Who Support Abortion, Except for Morally Grave Reasons: KY Bishops