Kamala Harris posted a tight lead over Donald trump in the first poll of Wisconsin voters since the Democratic National Convention ended last month.

Two possible explanations for why Harris’s poll numbers have begun to plateau and how we should think about the race ahead of Tuesday’s debate.

Tuesday’s debate between Democratic presidential nominee Kamala Harris and Republican Donald Trump attracted an audience of 57.7 million US viewers on eight major TV networks — beating the turnout for President Joe Biden’s ill-fated performance in June.