The story

Speaking to a group of evangelical Christians, Sen. Barack Obama said Saturday that his greatest moral failure -- and the country's -- has been selfishness, but his opponent, Sen. John McCain, cited his failed first marriage.

McCain, the presumptive Republican presidential nominee, added that the country's greatest shortcoming has been a tendency to not devote itself "to causes greater than ourselves."

"I think after 9/11, my friends, we should have told Americans to join the Peace Corps, expand the military, serve a cause greater than your self-interest," he said.

Obama told the Rev. Rick Warren that "we still don't abide by that basic precept of Matthew: that whatever you do for the least of my brothers, you do for me.

"That basic principle applies to poverty. It applies to racism and sexism; it applies to not thinking about providing ladders of opportunity for people to get into the middle class." Read full article »

CNN's Dana Bash, Tom Foreman, Ed Henry, Sasha Johnson and Rebecca Sinderbrand contributed to this report.

All About Religion • Rick Warren • Barack Obama • John McCain