Transcript for Alabama Senate race down to the wire
David mentioned, where they are down to the wire in a closely watched race for a U.S. Senate seat. The president in Pensacola last night, as you heard, urging his supporters to back Republican Roy Moore, a candidate accused of sexual misconduct with teenage girls. Allegations he says are not true. Voters heading to the polls on Tuesday. Here's ABC's Gloria Riviera. Reporter: Tonight, Doug Jones, the Democrat hoping to wrestle an Alabama senate seat away from Republicans taking his message to the black voters. This campaign has got the wind at its back because we are bringing people together from all across the state, and the other side is trying to divide us for man they bring people together. Reporter: Speaking in Selma later this weekend with civil rights icon, representative John Lewis, Jones hoping to weaken embattled Republican, Roy Moore, with strong African-American turnout, and counter president trump's outspoken support of Moore in this reliably red state. We can't afford to have a liberal Democrat who is completely controlled by Nancy Pelosi and chuck Schumer. We can't do it. His name is Jones, and he is their total puppet. Reporter: President trump on the attack, going after the credibility of one of the eight women who have accused Moore of sexual misconduct. You know the yearbook? Did you see that? There was a little mistake made. She started writing things in the yearbook. Reporter: Beverly Nelson telling ABC news Moore attacked her in his car when he was in his 30s and she was just 16. He was trying to pull me toward -- in between his legs. It was terrible. Reporter: As evidence, Nelson says she kept her high school yearbook with his signature, but recently acknowledging to Tom llamas, she did add who Roy Moore was, and when and where he signed her yearbook. He signed your yearbook? He did sign it. And you made some notes underneath. Yes. Reporter: Nelson's lawyers say they have had the signature confirmed by an expert. With 72 hours to go, it could all come down to voter turnout. Will infrequent voters who normally don't vote in a special election show up? What about moderate white voters who are put off by Moore? Will they stay home or vote for a Democrat? Tom. All eyes on Alabama. Gloria, thank you. And this programming note. That hotly contested Alabama senate race will be the focus tomorrow on "This week."
This transcript has been automatically generated and may not be 100% accurate.