"I don't think she's written anything from which people can draw global conclusions," said Lani Guinier, a professor of law at Harvard University. "She's a very careful judge, so you can't predict how she would [rule on a case] unless she has facts."
In a CNN poll, 68 percent of Americans said they opposed having the court "completely overturn" Roe v. Wade. But the margin of support has been slim on the Support Court, with recent rulings decided by a 5-4 majority.
While the scant judicial evidence of Sotomayor's abortion leanings has abortion rights groups concerned, groups on the opposite side of the political aisle are surprisingly sounding the same worry.
"The truth is it's not entirely clear how she would vote," Charmaine Yoest, president of pro-life organization Americans United for Life, told ABCNews.com.
"The thing, is in both of those cases, she upheld Supreme Court precedent," she said, referring to the cases involving the Mexico City Policy and the abortion clinic protestors. "Our concern is once she's elevated she doesn't face the same constraints."
Yoest said she was troubled by comments Sotomayor made at a Duke University panel four years ago, when the judge said, "All of the legal defense funds out there, they're looking for people with court of appeals experience, because it is -- court of appeals is where policy is made."
Sotomayor added after that statement: "And... I know this is on tape, and I should never say that, because we don't make law, I know. ... I'm not promoting it, and I'm not advocating it."
Yoest believes the abortion argument should not be in the hands of Supreme Court justices.
"Abortion forces want to put it [abortion issue] beyond reach of [the] American people... [But the] legislators are accountable to people," Yoest said. "She has defined a judge as a super legislator. ... Once she's on court, she's beyond the reach of the American people."
Sotomayor's comments during a 2001 lecture at the University of California-Berkeley that she hopes "a wise Latina woman with the richness of her experiences would more often than not reach a better conclusion than a white male who hasn't lived that life," has also raised concern among anti-abortion groups.
"In public policy, being woman is a code word for being an abortion supporter," Yoest said, questioning, "Does she define being a woman as being pro-abortion?"
The Rev. Rob Schenck, president of the National Clergy Council, admitted in a news conference Tuesday that they know little about the judge's views on abortion, only presuming that her ideology might be aligned with Obama's.
"We hope to be convinced that she may be further from that position than the president knows," Schenck said. "We have people doing exhaustive research."
If confirmed, Sotomayor would be the sixth Catholic on the court. Gibbs said as far as he knows, her religious background was not given any consideration when the president selected her.
Northup said Sotomayor's religious beliefs do not necessarily threaten her organization's agenda.
"People's religious beliefs and their views on the legal protections and what Constitution stands for are not necessarily synonymous," Northup said. "We have many judges who are able to apply the constitutional rulings as the law requires, and their religious beliefs are a separate matter."