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Honestly my first thought was that he used Obama's speechwriters for this. Was a great speech and seemed to flow and have the same tone we became familiar with during the obama presidency
It did sound that way. But, I do have to add that Biden did a good job with his delivery. The slow quite tone, getting even quieter when he wanted to make a particularly important point, was very effective. It also provided a stark contrast to the style of the man he is opposing.