Democrat leads by just over 1,000 votes in surprisingly tight Mississippi Senate race

On the campaign trail, Colom, a district attorney, focused his message on his Christian faith and plans to address economic concerns. He took aim at Trump's policies including the war in Iran and the rising cost of living in the US.

Wronski said Hyde-Smith, who was appointed to the role in 2018 to fill a vacancy, ran a mostly lacklustre campaign, relying on the state's reliably conservative base to deliver.

"The lack of public appearances was quite striking," Wronski added.

Trump campaigned alongside Hyde-Smith last month, saying he was there "because Cindy's doing great, but I just got to make sure. I can't take a chance".