The Tallahassee mayor conceded the race to Republican Ron DeSantis in a televised concession speech around 11 p.m. ET on election night.
"On Tuesday night, the Gillum for Governor campaign operated with the best information available about the number of outstanding ballots left to count", the statement read.
Gillum's campaign said it's monitoring the situation with an elections lawyer and preparing for a possible state-mandated recount.
Due to a combination of racism, Andrew Gillum's alleged involvement in an FBI investigation, the obvious suppression of 1.4 million formerly incarcerated people's votes, and a few other factors, Florida's major statewide races this year were remarkably close. Widespread belief in Florida that he would win easily and Trump threw his support behind DeSantis, DeSantis won the primary. "Maybe 80,000 people will wake up and say, 'OK, we didn't vote the last time'".
"But I'm here to tell you tonight, votes remain to be counted".
Kemp accused Democrats on Sunday of trying to hack voter registration systems, without offering any supporting evidence.
"It seems like we're living up to our history", said Bob Poe, who was Florida's Democratic Party chairman during the 2000 presidential recount.
Gillum, who leads by more than four percentage points in a polling average, said a victory by him would "send a message" to President Trump and to rival Ron DeSantis after a bitter race.
Republican Gov. Rick Scott is projected to defeat incumbent Democratic Sen.
In Georgia, the race for governor is too close to call, but Republican candidate Brian Kemp holds a narrow lead.
"Voters in white working-class areas are becoming more conservative - and hard-line conservative - and more Republican-aligned", Isbell said".
Additionally, most counties have yet to review and tabulate all provisional ballots cast in the election, and there's also a 10-day window on overseas vote-by-mail ballots to come into elections offices.
Gillum paused to speak with reporters after casting his vote from himself in Florida's closely watched gubernatorial race.
Before then, election canvassing boards in each county will review provisional ballots to determine if they are valid.
He also said the idea that thousands of voters looked at the governor's race as the most important and didn't vote in the Senate race also isn't plausible, saying even the state attorney general's race got more votes recorded.
Election officials in other Florida counties may have disclosed the identities of which voters cast provisional ballots, however.
In Florida, DeSantis was criticized for using coded racist language when he said Gillum would "monkey the state up" in an interview.