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The president is scheduled to speak to the National Urban League on July 25.

Mr. Biden outlined differences between the Obama administration and Mr. Romney’s agenda on health care, energy and women’s rights.

“I believe this election will come down to character, conviction and vision,” Mr. Biden said. “And it will not surprise you — I don’t think it’s even a close call. So it’s time for the NAACP to do what it’s always done … To stand up. Make our case. Stand our ground. And make real our vision for America.”

Mr. Romney told the convention that his policies would help “families of any color more than the policies and leadership of President Obama.”

“I have no hidden agenda,” Mr. Romney said. “If you want a president who will make things better in the African-American community, you are looking at him.”