Conservative evangelical Rob Schenck, president of the National Clergy Council, e-mailed reporters Tuesday to protest the visit because of Obama’s support of abortion rights. “Senator Obama’s policies represent the antithesis of biblical ethics and morality, not to mention supreme American values,” Schenck wrote. Saddleback responded with a statement acknowledging “strong opposition” to Obama’s participation. The church said participants were invited because of their knowledge of HIV/AIDS and that Warren, author of “The Purpose Driven Life,” opposes Obama’s position on abortion and other issues.

“Our goal has been to put people together who normally won’t even speak to each other,” the Saddleback statement said. “We do not expect all participants in the summit discussion to agree with all of our evangelical beliefs. However, the HIV/AIDS pandemic cannot be fought by evangelicals alone. It will take the cooperation of all - government, business, NGOs and the church.”

Obama did not respond to interview requests. But he issued a written statement saying while he respects differing views on abortion, he hopes for unity “to honor the entirety of Christ’s teachings by working to eradicate the scourge of AIDS, poverty and other challenges we all can agree must be met. It is that spirit which has allowed me to work together - and pray together - with some of my conservative colleagues in the Senate to make progress on a range of key issues facing America,” Obama’s said.

Brownback, who has close ties to conservative Christians, did not respond to requests for comment on the dispute. Though still in his first term in the Senate, Obama has attracted national attention for his fresh face, commanding speaking style and compelling personal story. He also has encouraged liberals to engage in religious discourse and not leave the topic to conservatives to claim as their own.