Former President Obama recorded a robocall that was released Monday to help boost Mike Espy in his underdog campaign to defeat Sen. Cindy Hyde-Smith (R) in Mississippi’s unusually tight Senate runoff Tuesday.

“Hi, this is Barack Obama Barack Hussein ObamaObama warns of a 'decade of unfair, partisan gerrymandering' in call to look at down-ballot races Quinnipiac polls show Trump leading Biden in Texas, deadlocked race in Ohio Poll: Trump opens up 6-point lead over Biden in Iowa MORE, and tomorrow is election day. My name may not be on the ballot, but our future is. And that’s why I believe this is one of the most important elections in our lifetime. Make a plan to vote tomorrow. I’m counting on you to be in line to vote before polls close,” he says in the call.

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The Mississippi contest to serve out the remainder of retired Sen. Thad Cochran William (Thad) Thad CochranEspy wins Mississippi Senate Democratic primary Bottom Line Mike Espy announces Mississippi Senate bid MORE’s (R) term advanced to a runoff after no candidate exceeded 50 percent of the vote in the general election earlier this month.

Recent missteps by Hyde-Smith have Democrats hoping they can pull off an upset in the Deep South reminiscent of Democrat Doug Jones’s victory over Republican Roy Moore Roy Stewart MooreRoy Moore sues Alabama over COVID-19 restrictions Vulnerable Senate Democrat urges unity: 'Not about what side of the aisle we're on' Sessions hits back at Trump days ahead of Alabama Senate runoff MORE in last year’s Alabama special election.

A reporter published a video earlier this month showing Hyde-Smith saying that she’d be “on the front row” if a supporter she was campaigning with invited her to a “public hanging.”

Hyde-Smith has said she made the comment in jest and repeatedly declined to comment on the matter beyond a statement describing the remark as an "exaggerated expression of regard" for a supporter.

The Jackson Free Press also reported last week that Hyde-Smith attended and graduated from a Mississippi segregation academy in the 1970s.

The report shows a yearbook picture in which Hyde-Smith poses with other girls and a mascot seemingly dressed as a Confederate general and holding a Confederate flag. The school was one of several private institutions set up to bypass integration after Mississippi Gov. John Bell Williams in 1969 ordered that public schools integrate. It also said Hyde-Smith sent her daughter to such a school.

A 2014 photo was also circulated last week showing Hyde-Smith wearing a Confederate soldier's hat with the caption “Mississippi history at its best!”

Espy, who is running to be Mississippi’s first black senator since Reconstruction, slammed some of the comments at a debate last week.

“I don’t want to go to yesteryear. I want to move forward,” he said.

The robocall’s release from one of the Democrats’ highest-profile names came the same day that President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE held two rallies in Mississippi to boost Hyde-Smith in the wake of the scandals. The runoff is already expected to be a low-turnout contest and both sides hope their party’s respective stars will motivate their base to head to the polls.

Obama has re-emerged as a powerful campaign surrogate, appearing at rallies for Democratic candidates across the country during the midterm cycle after remaining quiet for much of the beginning of Trump’s tenure.

Republicans currently have control of the Senate with 52 seats, but the Democrats will take control of the House in January after picking up at least 38 seats in the midterm elections.