Americans surveyed last week had more positive things to say about former Vice President Joe Biden than at any point in the previous eight weeks, according to The Breakthrough, a polling project co-sponsored by CNN./Source: CNN/SSRS/Georgetown University/University of Michigan/Credit:	Janie Boschma, CNN

Americans surveyed last week had more positive things to say about former Vice President Joe Biden than at any point in the previous eight weeks, according to The Breakthrough, a polling project co-sponsored by CNN./Source: CNN/SSRS/Georgetown University/University of Michigan/Credit: Janie Boschma, CNN

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Positivity on Biden hits high after the DNC takes center stage

The Democratic National Convention took over the conversation surrounding the presidential race this week, and more Americans had positive things to say about the party's nominee -- former Vice President Joe Biden -- than at any point in the last eight weeks.