Michelle Obama had a sly rebuke for Republicans who've been making hay of her husband's "you didn't build that" remark.

Mitt Romney and his supporters say President Barack Obama's comment shows he values government over entrepreneurs struggling to build their own businesses. The president says he was talking about the importance of teachers, roads and other government works that businesses rely on.

Mrs. Obama, in her speech to the Democratic convention, gently revisited the issue as she talked about lessons she and her husband learned from their families.

"We learned about gratitude and humility - that so many people had a hand in our success, from the teachers who inspired us to the janitors who kept our school clean - and we were taught to value everyone's contribution and treat everyone with respect," the first lady said.

She also responded indirectly to her rival Ann Romney's criticism of Democrats who've attacked Mitt Romney's success in business.

"Our families weren't asking for much," Mrs. Romney said. "They didn't begrudge anyone else's success or care that others had much more than they did - in fact, they admired it."

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