On the campaign trail, the Democratic White House hopefuls have been facing some tough questions on a subject we haven't heard much about.
The candidates are campaigning hard in the crucial state of Pennsylvania.
Over the weekend, Barack Obama continued to address his controversial remarks about blue-collar workers being bitter and clinging to guns or religion.
"When you're bitter, you turn to what you can count on. So people, they vote about guns. Or, they take comfort in their faith or their family or their community," Obama said.
On Sunday, the controversy spilled over into the first-ever forum about faith and politics, the Compassion Forum.
"From my perspective, the characterization of people in a way that really seemed to be elitist and out of touch, is something that we have to overcome," Clinton said.
Obama defended his remarks.
"So, what I was referring to was, in no way, demeaning of faith that I, myself, embrace," Obama said.
Both candidates were given equal time to answer all sorts of questions, ranging from abortion to when life begins.
"I believe that the potential for life begins at conception," Clinton said.
"This is something that I have not, I think, come to a firm resolution on. I think it's very hard to know what that means -- 'When life begins,'" Obama said.
Presumptive GOP nominee, Sen. John McCain, was invited to attend the forum but declined.
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