A voter checks in at the Neighborhood Church polling station in Candler Park, Atlanta, Georgia, during the Georgia Senate runoff elections on Monday. Photo: AFP

Democratic senator Raphael Warnock and his Republican challenger Herschel Walker, who is backed by former president Donald Trump, will clash in a hotly contested runoff after neither of the African American candidates earned more than 50 percent in the November 8 midterm election.

With Warnock, 53, and Walker, 60, running neck and neck, Biden has urged Georgians to turn out and vote Democrat. "It really is critical," the president has said.

Even though Democrats have already retained control over the Senate in vote in November, albeit just barely, this election is nonetheless decisive for Biden.

Republicans see the Georgia Senate seat as a chance to boost their ability to block Biden's policies, having won back control of the House of Representatives.

With 700 days to go before the 2024 presidential election, Republicans hope to stymie Biden's momentum, after his party performed much better than expected in November.

For Democrats, on the other hand, a Warnock victory would help consolidate their paper-thin Senate majority and allow them to wield greater influence in key congressional committees.

It would also significantly curb the power of centrist Democratic senator Joe Manchin, who has already blocked several major Biden initiatives in the first two years of his term.

Some 1.9 million people have voted early, many of them likely Democratic voters, while Republicans are expected to turn out in force on Tuesday.

With the two candidates running head to head, according to most recent polls, the outcome is hard to predict.

Historically a Republican state, Georgia took America by surprise when voters chose Biden over Trump in the 2020 elections and then sent two Democrats to the Senate two months later in another runoff.

For this time, while both of the candidates are natives of Georgia, the men however are polar opposites.

Born the eleventh of 12 children to a former soldier and preacher father and a mother who worked in the cotton fields, Warnock grew up in poverty.

Even after his election, Warnock remained as senior pastor in an Atlanta church where slain civil rights icon Martin Luther King Jr once preached.

Walker, the 60-year-old conservative is considered one of the best players in the history of American college football.

Walker, who is staunchly anti-abortion, even in cases of rape, has been the subject of several recent scandals, having been accused of paying for abortions of two women he had relationships with.

AFP