My brother in Christ do you think people voted for Trump because he was the more intelligent choice? He says dumber things than that all the time, and puts them into policy.
Heck, let's make it bipartisan - Obama once said he campaigned in "all 57 states." Minor gaffes like this don't actually matter, they happen all the time. What matters is platform and policy, and the only people I've seen who had an opinion on Kamala Harris' platform were Democrats. The Republicans she wanted to court were never going to vote for her on principle, and the fence-sitters were too disillusioned and cynical to bother showing up.