Obama's "Bitter" Comment is Obama Only Speaking of the Truth

I do not understand the issue and debate about what Barrack Obama has said because for me it is indeed factual but as the saying goes... "the truth hurts but it is the truth." Obama recently explained about these comments and was posted on youtube. You can view the video below.
Clinton, who is trailing Obama in the popular vote and pledged delegates, has pounded Obama since audio from his San Francisco appearance was posted on The Huffington Post Web site. She hoped the comments might give her a new opening to court working-class Democrats less than 10 days before the Pennsylvania primary on April 22, which she needs win to keep her campaign going.
At the San Francisco fundraiser, Obama tried to explain his troubles in winning over some blue-collar voters, saying they have become frustrated with economic conditions: "It's not surprising, then, they get bitter, they cling to guns or religion or antipathy to people who aren't like them or anti-immigrant sentiment or anti-trade sentiment as a way to explain their frustrations."
Obama's comments came up later Sunday in a forum on faith and values at Pennsylvania's Messiah College.
"What I was saying is that when economic hardship hits in these communities, what people have is they've got family, they've got their faith, they've got the traditions that have been passed onto them from generation to generation," Obama said at the forum, which was televised on CNN. "Those aren't bad things. That's what they have left."