(CNN) -- The congressional showdown over Kansas Gov. Kathleen Sebelius' nomination to President Obama's Cabinet may focus less on her qualifications than on the issue of abortion, analysts said.

Then-presidential candidate Barack Obama listens to Gov. Kathleen Sebelius during a January 2008 rally.

Obama  on Monday nominated Sebelius to head the Department of Health and Human Services. Cabinet nominations require Senate confirmation, and anti-abortion groups already are making their views known.

Analysts suspected that Obama would face a battle over abortion if and when he makes a nomination to the U.S. Supreme Court, but religious conservatives could use Sebelius as a warm-up for the seemingly inevitable fight.

Calling Sebelius an "enemy of the unborn," Catholic League President Bill Donohue said the Kansas governor's nomination is particularly disturbing because the health and human services secretary is one of the few members of the administration who can directly affect abortion policy.

"Sebelius' support for abortion is so far off the charts that she has been publicly criticized by the last three archbishops of Kansas City," Donohue said in a statement.  Watch why filling the Cabinet post is urgent task »

The liberal group Catholics United has come to Sebelius' defense, saying the Kansas governor has taken several steps to lower the abortion rate in her state. The group also has posted excerpts of a 2006 speech in which Sebelius said she opposed abortion.

"My Catholic faith teaches me that all life is sacred, and personally I believe abortion is wrong," she said then. "However, I disagree with the suggestion that criminalizing women and their doctors is an effective means of achieving the goal of reducing the number of abortions in our nation."

In May, Archbishop Joseph F. Naumann of Kansas City, Kansas, said that Sebelius' stance on abortion had "grave spiritual and moral consequences." He asked that Sebelius no longer receive Communion until she repudiated her stance and made a "worthy sacramental confession."

Naumann was reacting to Sebelius' veto of state Senate Bill 389 and the subsequent House version, titled the Comprehensive Abortion Reform Act, either of which would have tightened abortion regulations in Kansas.

In shooting down SB 389 in April, Sebelius wrote that the bill was problematic because it included no exceptions for pregnancies that endanger a woman's life and it allowed for individuals to seek court orders preventing a woman from obtaining an abortion, even if the procedure was necessary to save her life.

"I am concerned that the bill is likely unconstitutional, or even worse, endangers the lives of women," Sebelius said in a statement.

She further said that Kansas had striven to lower its abortion rates through adoption incentives, extended health services for pregnant women, sex education and support services for families.

Another lightning rod for Sebelius is attendance by Dr. George Tiller and his staff at a 2007 reception she held at the governor's mansion in Topeka. The doctor, who specializes in late-term abortions and once received the National Abortion Federation's highest honor, won the reception at a charity auction held for the Greater Kansas City Women's Political Caucus, according to the Topeka Capital-Journal.

Tiller is presently facing charges relating to his practice.

Last month, a district judge denied a motion to dismiss the case, meaning Tiller will go to trial on 19 misdemeanor counts relating to how he procured second opinions for late-term abortions, according to The Wichita Eagle.

Though Sebelius is dogged by many on the religious right, GOP Sens. Sam Brownback and Pat Roberts of Kansas seem willing to give her a pass on her stance on abortion.

Brownback, who sought the GOP presidential nomination and is one of the leading anti-abortion voices in the Senate, recently released a statement with Roberts, congratulating Sebelius and expressing an eagerness to work with their fellow Kansan on health issues.

The senators said they expect to have several differences of opinion with the Obama administration -- especially on health care funding and nationalized health care -- but they make no mention of the abortion issue.

David Brody, who covers the White House for the Christian Broadcasting Network
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