Vice President Kamala Harris’ nominationacceptance speech to her party’s convention on Thursday night drew an average of 28.9 million cable viewers, Nielsen ratings show, edging Donald Trump’s audience for his party address last month by about a half-million. Over the four-night runs of the conventions, an average of 3 million more people watched the Democrats than the Republicans—21.8 million to 18.9 million viewers, Politico reports. Among Democratic conventions, this one averaged about 200,000 more viewers than the 2020 version featuring Joe Biden. But it drew 8.2 million fewer than the 201…