No, Vote Spikes on Election Night Do Not Indicate Voter Fraud
Briefly

Sudden increases in vote totals are a normal part of how election results are reported. All real-time election feeds rely on unofficial data collected from precincts.
In some states, mail-in ballots are counted first, while in others, they are counted last, affecting how and when candidates surge in vote totals.
These surges happen in every election and can benefit any candidate. The 2020 election illustrated this with Biden’s votes reported overnight as Trump supporters slept.
Claims of voter fraud have misinterpreted the surge in vote totals, which often reflect procedural differences in how various regions count and report votes.
Read at www.nytimes.com
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