Will Barack Obama’s stand on abortion split Catholics? The New York Times ponders that very possibility:

Sixteen years ago, the Democratic Party refused to allow Robert P. Casey Sr., then the governor of Pennsylvania, to speak at its national convention because his anti-abortion views, stemming from his Roman Catholic faith, clashed with the party’s platform and powerful constituencies. Many Catholics, once a reliable Democratic voting bloc, never forgot what they considered a slight.

This year, the party is considering giving a speaking slot at the convention to Mr. Casey’s son, Senator Bob Casey of Pennsylvania, who like his late father is a Roman Catholic who opposes abortion rights.

The likely shift reflects concern among Democrats that they need to do more to regain the allegiance of Roman Catholic voters, who broke decisively for President Bush in 2004 and could be crucial to the outcome in a number of battleground states this year. Senator Barack Obama, the presumptive Democratic nominee, lost the Catholic vote badly to Senator Hillary Rodham Clinton, who, like Mr. Obama, is a supporter of abortion rights, during the primaries in states like New Hampshire, Missouri and Ohio. In Pennsylvania, Catholic voters preferred Mrs. Clinton to Mr. Obama by a 40-point margin.

The Obama campaign is being close-mouthed about its convention plans and would not confirm whether Mr. Casey would be given a prime-time speaking slot. Howard Dean, chairman of the Democratic National Committee, said that the call was Mr. Obama’s, but that a prominent speaking role for Mr. Casey would assist in the candidate’s efforts to woo Roman Catholic voters.

Mr. Casey, who endorsed Mr. Obama early and campaigned extensively for him in Pennsylvania, said there was no formal offer yet from Mr. Obama or the party. But, he said, “I think we’ll get something worked out.”

Mr. Casey’s appearance would be an important signal to Catholics, especially those who follow church teachings and oppose abortion. Mr. Obama could also use his choice of a vice-presidential running mate to reassure Roman Catholics. Among those that his campaign is vetting is Gov. Tim Kaine of Virginia, a Roman Catholic whose faith has been part of his political identity. At least three other Catholics have also been mentioned as possible running mates: Senator Joseph R. Biden Jr. of Delaware, Senator Christopher J. Dodd of Connecticut and Gov. Kathleen Sebelius of Kansas.

Although abortion is central to the political crosscurrents around Catholics — Ms. Sebelius has vetoed a number of bills that would restrict abortion rights in Kansas, prompting the archbishop of Kansas City to suggest that she stop receiving communion — part of Mr. Obama’s strategy is to emphasize that there are other issues on which they can base their votes. It would be a way to address the perception that Mr. Obama has a “Catholic problem.”

Douglas W. Kmiec, a conservative Catholic legal scholar at Pepperdine School of Law, said that although the formal teachings of the American Catholic bishops put primacy on the sanctity of life, including fetuses and embryos, doctrine allows for voting on other grounds, including the Iraq war, which the Vatican has opposed from the start.

Mr. Kmiec, a Republican who served in the Justice Department under President Ronald Reagan, said he was supporting Mr. Obama because his platform met the standard of justice and concern for the poor the church has always defended. This year, Mr. Kmiec was denied communion by a priest at a gathering of Catholic business people because of his support for Mr. Obama. Mr. Kmiec said, “The proper question for Catholics to ask is not ‘Can I vote for him?’ but ‘Why shouldn’t I vote for the candidate who feels more passionately and speaks more credibly about economic fairness for the average family, who will be a true steward of the environment, and who will treat the immigrant family with respect?’ ”

He urged Mr. Obama to invite Mr. Casey to speak as an answer to those who believe they cannot vote for someone who supported abortion rights.

Mr. Kmiec’s and Mr. Casey’s views put them in conflict with millions of lay Catholics, for whom abortion is a nonnegotiable issue, and many Catholic clerics, including Archbishop Charles J. Chaput of Denver, the site of the Democratic convention.

Archbishop Chaput, who has stopped short of telling his flock how to vote, has called abortion a “foundational issue.” He has said that a vote for a candidate who supports abortion rights or stem-cell research, like Mr. Obama or Senator John Kerry in 2004, was a sin that must be confessed before receiving communion. Mr. Obama’s Republican rival, Senator John McCain, an opponent of abortion rights, met last week in Denver with Archbishop Chaput.

The archbishop declined an interview request but his spokeswoman, Jeanette DeMelo, said that his views had not changed. In a column this year, Archbishop Chaput wrote that Catholics could support a politician who supported abortion only if they had a “compelling proportionate reason” to justify it. “What is a ‘proportionate’ reason when it comes to the abortion issue?” the archbishop wrote. “It’s the kind of reason we will be able to explain, with a clean heart, to the victims of abortion when we meet them face to face in the next life — which we most certainly will. If we’re confident that these victims will accept our motives as something more than an alibi, then we can proceed.”

There’s more at the Times link.