Hyde-Smith will defeat Democrat Democrat Mike Espy, a former congresswoman and secretary of agriculture, in the final race of the Senate to be decided in 2018. The victory will make her the first woman elected to the Mississippi Congress.
His victory on Tuesday means that Republicans will have 53 seats for the 47 seats of Democrats in the Senate in January. The Republican Party increased its majority in the Senate with two seats in the mid-year elections, even when the Democrats took control of the House.
The Hyde-Smith victory also means there will be 24 women in the Senate next year. That will set a new record for women serving in the Senate, one more than the current maximum, established during this Congress.
Hyde-Smith will end the last two years of the term of former Senator Thad Cochran, who retired earlier this year due to health concerns. Hyde-Smith will have to run again in 2020 to serve a six-year term.
President Donald Trump visited Mississippi on Monday to gather Republican voters behind Hyde-Smith after his comments on a "public hanging" sparked weeks of controversy.
It began when the video emerged online from its supporters earlier this month who would be "in the front row" if one of its supporters "invited me to a public hangout." He later called the comments an "exaggerated expression of respect," but his use of the phrase brought back memories of the history of Mississippi lynching and put the contest under the national microscope.
Asked about his comment in a debate, Hyde-Smith said he would "certainly apologize" to anyone who felt offended, but was then attacked by his opponent.
"This comment was twisted and turned into a weapon to be used against me," said Hyde-Smith.
The comments of Hyde-Smith prompted to delve into its history.
The same progressive blogger who posted the video of her using the phrase "hanging in public" later published one in which Hyde-Smith told a small group at Mississippi State University to suppress the votes of students at other universities It was "a great thing". His campaign said it was a joke, but that explanation failed when the black student saw him laugh at an image of the event that his campaign posted on Twitter that the Hyde-Smith campaign was using as a prop.
On Friday, Jackson Free Press reported that Hyde-Smith had attended a private high school that was founded in 1970 so that white parents could avoid attempts to integrate public schools. Hyde-Smith's daughter later attended a similar private school established at about the same time, according to Free Press. The senator's campaign responded to the report by attacking the "liberal media."
Over the weekend, CNN reported that Hyde-Smith once promoted a measure that praised a Confederate soldier's effort to "defend his homeland" and had promoted a revisionist view of the Civil War.
In the photos posted on his Facebook account in 2014, Hyde-Smith was photographed posing with Confederate artifacts during a visit to Beauvoir, the home and library of Confederate President Jefferson Davis. The legend of the post said: "The best of Mississippi history!"
Democrats expected an increase in turnout among black voters, who make up nearly 40% of the Mississippi population, most of the nation, could lead Espy to victory in a highly polarized state on racial lines, with the majority of white voters supporting Republican Party candidates and black voters who support Democrats.
Espy's campaign hit Hyde-Smith with television ads that considered it a shame for a state that tried to overcome its history of slavery and racism.
"We have worked hard to overcome the stereotypes that damage our economy and cost us jobs, their words should not reflect the values of Mississippi," a narrator said in an announcement. The announcement also called Hyde-Smith "so embarrassing that it would be a disaster for Mississippi."
Several companies that had donated to the Hyde-Smith campaign, including Walmart, publicly withdrew their support of the senator for the "public" comment.
The controversies that surrounded her provoked a big boost from the national Republicans to avoid the same shame they had suffered last year in Alabama for the Roy Moore Senate campaign and saving Hyde-Smith.
While Hyde-Smith remained largely out of the campaign, the party's infrastructure came together in its defense. Republican Party groups spent $ 4 million in the second round of Mississippi, much more than the $ 1.2 million Democrats, according to the Federal Election Commission documents. Republican groups spent more than twice as much as Democrats on television ads, according to the Kantar / CMAG ad tracking firm.
Trump's visits to Mississippi on Monday night were also seen as an attempt to reunite the Republican base to vote in an election that will take place two days after the Thanksgiving weekend.
Adam Levy of CNN contributed to this report.