"John McCain has a vision that is very similar to George Bush's. He wants to continue in Iraq on the current course," he said.
"John McCain's main economic platform is to continue the Bush tax cuts and then to add $300 billion worth of corporate tax breaks that aren't paid for."
Obama indicated he's likely to travel to Iraq in the coming months.
First Black Major Party Nominee
Obama admitted that he has not fully grasped the enormity of his accomplishment, becoming the first black man to secure the Democratic presidential nomination. "There's something very humbling about this whole process. You know, you realize there are so many wonderful people in this country who are working so hard on behalf of their families and on behalf of their hopes and their dreams."
For Obama's young daughters, the historic nature of a black man becoming the standard bearer of a political party has had little impact, the candidate said.
"Michelle had a conversation with Malia, whose our 9-year-old, soon to be 10-year-old," Obama told Gibson, referring to his wife and daughter. "And Michelle brought this up, and she said, 'you know, Daddy's about to be nominated for the presidency and he'll be the first African American ever to have that happen,' and Malia said, 'Well, that doesn't surprise me.'"
The senator explained that his daughter's nonchalant attitude about the nomination is proof the country has made great progress.
"You could tell that there wasn't that emotional impact on her because she has grown up in this environment where she can take it for granted -- in the same way that she can take for granted that a woman is running for president, and is an incredibly capable political figure," he said.
"And the fact that they're taking it for granted is a measure of progress. It says something really good about America."