"He has the unique skills to try to lower the temperature and foster a sense of common ground."

So says Senator Robert P. Casey Jr., the antiabortion Democrat from Pennsylvania, about Barack Obama, who has never voted for a restriction on abortion. Is Casey's support so surprising? He has to pick one Democrat or the other, and now is the time to use the power of his endorsement.

Casey's endorsement is particularly important because Obama's ability to reach these voters is even more in question in light of the controversy provoked by his description of small-town Pennsylvania voters as driven by bitterness over their economic situation and looking for ways "to explain their frustrations."..

Obama did not mention abortion in his controversial remarks, made last week at a fundraiser in California, though he noted other divisive social issues. But last week in Indiana, he said that both sides of the abortion debate are guilty of hyperbole.

"The mistake pro-choice forces have sometimes made in the past, and this is a generalization . . . has been to not acknowledge the wrenching moral issues involved," he said. "And so the debate got so polarized that both sides tended to exaggerate the other side's positions. Most Americans, I think, recognize that what we want to do is avoid, or help people avoid, making this difficult choice. That nobody is pro-abortion -- abortions are never a good thing."

Asked last night at a nationally televised forum on religious and moral values if there can be "common ground" on abortion, Obama said that "people of good will can exist on both sides." With Casey watching from the audience at Messiah College outside Harrisburg, Pa., he added that while there will always be irreconcilable differences between opponents and supporters of abortion rights, "we can take some of the edge off the debate."