Back in December 2006, a few weeks before President Obama, then a senator, made his final decision about seeking the White House, he shared a stage with Sen. Sam Brownback, a conservative Republican from Kansas.
Brownback has been one of the leading figures on the Christian right. He has found common cause with several Democrats on issues like sexual trafficking and violent entertainment.
According to Game Change, the new account of the 2008 presidential campaign, both men had been invited on World AIDS Day to the California megachurch of evangelical Pastor Rick Warren.
Obama later returned the favor by asking Warren to give the invocation at his inauguration.
Brownback spoke first, telling Obama, "Welcome to my house," the book stated.
When Obama spoke, he said, "There is one thing I've gotta say, Sam, though: This is my house, too. This is God's house."
The authors, Mark Halperin and John Heilemann, said Obama quoted Scripture and talked about using condoms to curb the spread of HIV. The crowd gave him a standing ovation.