The Republicans cheated blatantly

Ignoring everything they probably did to voting machines that is currently being discussed in courts, we know for a fact that hundreds of democratic voting centers were called with bomb threats.

Current voting fraud court case https://www.newsweek.com/2024-election-lawsuit-advances-2083391

Report of known election interference from 2024 https://www.cip.uw.edu/2024/11/05/election-day-bomb-threats-tabulator-irregularities/

That alone probably fucked with tens to hundreds of thousands of votes.