Polls leading up to Tuesday's election showed the two candidates to be virtually tied, with Abrams leading Kemp by less than a single percentage point.
"Well, it's just a report. Hey, fake news, right?" Larry Schweikart told Buzzfeed.
"He represents everything that Donald Trump isn't," said Pamela Aguirre after voting in Beto O'Rourke's El Paso district.
The former vice president also poked fun at Trump's claim about the "million" people who attended his inauguration.
The president has said he would welcome many of the Democrats linked to a 2020 run.
Critics question timing of exercise taking place in Democratic candidate Beto O'Rourke's hometown.
Should Republicans prevent a much-discussed "blue wave," Trump's takeover of the party will be cemented even further.
Polls show Democrats potentially taking back the House, but Republicans could make gains in the Senate on Tuesday.
As the crowd broke into song, President Donald Trump nodded his head along with the words.
The president was in typically brash form when confronted by hecklers.
"Sometimes you hear things about, 'Oh, you want a border wall? Oh, you must hate Mexicans,'" Fox News host Jesse Watters said.
This year's election cycle is expected to smash voter turnout records for a midterm year, as more than 30 million Americans have already cast early ballots.
"It's a real risk that voters will think polls are fake news and stay home, that's a massive risk," said Republican strategist Evan Siegfried.
If Gillum wins his election, he'd be "the governor of the third-largest state in the country, he's African American, and he pulled off a significant upset. I think he would be a contender for vice president, at least," said Corey Lewandowski.
The president's approval rating does not offer much for Republicans to be positive about ahead of Tuesday's voting.
The Trump campaign said in a statement that Hannity and Limbaugh were "longtime friends" of the president and "strong advocates" for his "America First" agenda.