Former U.S. President Barack Obama and his wife Michelle Obama delivered a one-two punch at the Democratic National Convention on Tuesday night, urging Americans to back Kamala Harris in her 11th-hour presidential bid against Republican Donald Trump.

America's first Black president, Obama has thrown his considerable political capital behind Harris as she seeks to make history herself on Nov. 5 as the first woman and first Black and South Asian person to be elected U.S. president.

"We do not need four more years of bluster and bumbling and chaos. We have seen that movie before, and we all know that the sequel is usually worse," Obama told delegates on Day Two of the Chicago convention.