Tainted by scandals, the race is one of the most hotly contested senatorial elections in years with Democrats hoping they can break the Republicans' hold on Alabama.
Facing voters after the year's most bitter US election campaign, Alabama Republican Roy Moore cast himself on Monday as the victim of a national barrage of unjust allegations of sexual misconduct with teenagers.
Speaking at a Monday night rally, Moore, 70, urged his supporters to get to the polls Tuesday and called the article that first raised allegations against him "disgusting."
"If you don't believe in my character, don't vote for me," he said.
Moore, who was twice removed as state Chief Justice for thwarting court orders regarding the Ten Commandments and same-sex marriage, argued the nation must "go back to God."
"I want America great and I want America good and we can't be good until we go back to God," Moore said.
Meanwhile, rival Doug Jones, hoping to become the state's first Democratic senator in two decades, declared their race was Alabama's referendum on "who we are and what we're going to tell our daughters."
Allegations aside, President Donald Trump said in a robocall to Alabama voters that he badly needs Moore's own vote in the US Senate. Former President Barack Obama and his vice president, Joe Biden, recorded calls for Jones seeking to break the GOP's lock on statewide office in Alabama.
Whether the calls would sway anyone so late in such a highly publicised campaign was an open question. But so too was the impact of a rash of false news stories that have appeared on social media spreading misinformation.
TRT World's Tetiana Anderson reports.
One website wrongly claimed that one of the women who have accused Moore of sexual misconduct had recanted. Meanwhile, Moore's detractors took to social media to claim he had written in a 2011 textbook that women shouldn't hold elected office. He hadn't done so.
On election eve, Moore called in to a conservative talk radio show in Alabama to lament the tone of the campaign and portray cast himself as the victim of the sexual misconduct allegations.
"We've seen things happen in this campaign that I can't believe to this day," said Moore, who has denied all wrongdoing in contacts with the women who said he behaved inappropriately when they were in their teens and he was a local prosecutor in his 30s. One said he initiated sexual contact when she was 14.
"It's just been hard, a hard campaign," said Moore.
Alabama has been a solidly Republican state for years, and Moore says he is much more in tune with the issues that matter to voters — and to the president.
Jones acknowledged Monday in Montgomery, "Look, I'm not going to be the senator that everybody in the state can agree with 100 percent of the time."
But he added, "They'll know I'm somebody that will sit down with them. I will learn from them... I will try to be the public servant I think a US senator ought to be."
Voters seemed as divided as ever, including young Alabamians, some going to the polls for the first time.
Lillian Woolf, 18, a University of Alabama freshman, said she was disgusted that some people would vote for Moore despite the allegations by multiple women.
"It creeps me out," she said. "It shocks me just how much people are willing to ignore a person's past just because of their political stance."
But Joseph Chesnut, 20, a junior, said he will be voting for Moore, who "holds more Republican values ... just his Christianity standpoint and his Second Amendment standpoint and just, you know, trying to fight the establishment up there."
For Alabama Democrats, the special election is viewed as a chance to renounce a history littered with politicians whose race-baiting, bombast and other baggage have long soiled the state's reputation.
Many Republicans see the vote as an opportunity to ratify their conservative views — referred to by Moore as "Alabama values" — and protect Trump's agenda ahead of the 2018 midterm elections. But the sexual allegations have dented some of that support. Sen. Richard Shelby said "I think the Republican Party can do better," and he wrote in another Republican's name.
The two candidates have taken very different approaches to campaigning, with Jones holding events regularly and Moore popping up only occasionally in small churches, rallies or in interviews with friendly media.
In a morning stop at a diner in Birmingham, Jones accused Moore of disappearing during the campaign's closing days and claimed the Republican wasn't even in Alabama over the weekend.
"We're making sure our message is getting across while Roy Moore hides behind whoever he's hiding behind," said Jones.
Moore has made only a few public appearances since women came forward to accuse him of sexual misconduct years ago.
Moore, the former judge, has spent two decades advocating conservative Christian positions. Jones is a former federal prosecutor best known for prosecuting two Ku Klux Klansmen responsible for killing four black girls in a 1963 church bombing.
The winner will take the seat held previously by Trump's attorney general, Jeff Sessions. Republicans control the Senate with 52 seats.
Democrats don't hold a single statewide office in Alabama, and both houses of the Legislature are controlled by the GOP.