It's all about two places.
If the Republicans win one of the seats, they will get a majority in the Senate, so the Democrats must win both seats.
Opinion polls suggest there will be an even story, and there are parts that speak for both Republicans and Democrats.
- What speaks for the Republicans is history.
If they just go and vote, they should win this, says Fouad Youcefi.
What speaks for the Democrats is actually Donald Trump, who still claims election fraud, and who will hold a campaign meeting during the evening.
- It may be that he urges people not to really go to the polls, at least that is the fear that many Republicans have, says Fouad Youcefi.