That connection is much less loose if you consider how right wing the democrats have gotten over the years. And beyond that, note that a big part of Harris' loss is that her republican light "I'm basically Nikki Haley" campaign mainly reflects itself in people not voting for her. The statistics you mention (or the polls you base your comment on, not sure where it's coming from) are presumably talking about voters, not the electorate. Harris' inability to mobilize her base is the problem here, not republicans voting republican.