It’s been called the “red mirage” or the “blue shift.”
It’s the recent phenomenon by which an apparent Republican lead early after polls close on election night is erased by the counting of mail-in ballots later in the evening or in the days after Election Day.
Former President Donald Trump has pointed to the red mirage to back up his baseless allegations of election fraud. In reality, it has been a function of the rise of mail-in voting and the often-peculiar rules about when those ballots can be counted.
What happened in 2020: When most Americans went to bed on election night in 2020, on November 3, the end result was far from clear.
The contest between then-President Trump and now-President Joe Biden was still too early to call in the key states of Arizona, North Carolina, Nevada, Wisconsin, Michigan, Maine, Georgia and Pennsylvania.
The following days would include dramatic hours spent watching the counting of votes in these states. The vote count didn’t reflect a Biden lead in Georgia until early in the morning of November 6, when, as CNN’s Phil Mattingly showed viewers on the Magic Wall, small batches of votes were being counted and affecting the very close election.
CNN was able to project that Biden would win the election four days after Election Day, on November 7, but counting would continue. An analysis by researchers at the Massachusetts Institute of Technology found that counties won by Biden counted slower, on average, than counties won by Trump.
In 2020, the slowest-counting states were places like California, which are heavily Democratic and where every registered voter is sent a mail-in ballot. That means a blue shift in the popular vote could still occur even if it does not delay figuring out the presidential election results.
Remember: While news networks like CNN might project a winner when it is clear who will win, the races are not officially certified until later. Certification deadlines vary from state to state, but they all have until December 11, 2024, to complete recounts, if needed, and settle disputes around presidential results.