He told ABC News' Kate Snow earlier that the people who judged her comments early in the primaries don't really know her.
"I think people who got upset with that," he said, "don't know her and the other are people who want to hang on to things like that to bring her down."
Tonight the potential first lady calmly delivered her speech hoping to convince Americans that she and her husband are ready for the White House.
"So tonight, in honor of my father's memory and my daughters' future - out of gratitude to those whose triumphs we mark this week, and those whose everyday sacrifices have brought us to this moment - let us devote ourselves to finishing their work; let us work together to fulfill their hopes; and let's stand together to elect Barack Obama President of the United States of America," she said.
On the convention floor in Denver tonight, Democratic delegates expressed support for Obama's wife.
"She is the perfect person to introduce him," Lisa Ross, 45, a lawyer and Mississippi delegate said.
Ross said the attacks are "unfair but if anyone can handle it michelle obama can. I think they'll find they need to find someone else to pick on. She won't be bullied."
Mississippi delegate Mary Katherine Brown said, "I thought it was wonderful because it was so clearly genuine, an American story that we all recognize," she said, "We have all talked about the things that make us uniquely American -- belief in country, creating a better life for our children, and the constant work to make that happen for our families."
ABC News' Kate Snow, Nitya Venkataraman, Sara Just, Teddy Davis, David Chalian, Karen Travers, and Eloise Harper contributed to this report.