Mailing ballot counting results could lead to two stages of "red illusion" and "blue shift".

According to CNN, the 'Red Mirage' refers to the phenomenon where the Republican Party initially leads on election night, but the situation changes to the Democratic Party leading due to the counting of mail-in ballots in the evening or in the following days. Trump used this phenomenon to accuse election fraud, but it is actually caused by mail-in voting and the counting rules of each state. In 2020, Biden's lead in Georgia did not become apparent until the early morning of November 6th, while in 2016, Hillary also experienced a similar shift in the general election vote count but it did not change the result. Each state must complete election certification no later than December 11, 2024.