The South Carolina Senate race is now a tossup, a new New York Times/Siena poll showed. Republican Senator Darline Graham leads Democrat Annie Andrews by less than one percent. This state has not elected a Democrat to the Senate since 1998, but many voters now see a very tight contest.

Senator Darline Graham, the South Carolina Republican, is struggling to replicate her late brother's success. Republicans lead in the Florida Senate race and Democrats are up in Minnesota.

The Senate race in the usually reliably Republican state of South Carolina is effectively tied, according to new New York Times/Siena polls, as Senator Darline Graham's bid to succeed her brother, Lindsey Graham, for a full term has become a tossup.

Ms. Graham, the Republican incumbent, was appointed to serve the remainder of her brother's term after his death in July and decided to run for a full term with the encouragement of President Trump. She leads Dr. Annie Andrews, the Democratic nominee, by less than a single percentage point, making South Carolina a surprising battleground this year and widening Democrats' possible paths to win control of the Senate.

South Carolina has not elected a Democrat to the Senate in this century.

Republicans are ahead in the Florida Senate race, but by a relatively small margin. Senator Ashley Moody, the Republican incumbent, leads the Democratic Senate nominee, State Representative Angie Nixon, by six points. It is a moderate lead in a state that Republicans won by double-digit margins in 2024 and 2022.

And Democrats lead comfortably in Minnesota, a blue state where the party worried its progressive Senate nominee could falter, suggesting that Republican efforts to make the contest about fraud in state government may not be having an impact on the race. Lt. Gov. Peggy Flanagan, the Democratic nominee, is ahead of Michele Tafoya, the Republican nominee, by 14 points.

The three states had been on the fringes of a contested Senate map that remains unusually wide and unsettled in the final days of the midterm campaign. The polls showed that South Carolina has moved squarely to the map's center, as Republicans -- dragged down by Mr. Trump's unpopularity -- have been forced to defend more seats in redder states than they expected just a few months ago.

Mr. Trump won South Carolina by nearly 18 points in 2024, and the state has not elected a Democrat to the Senate since 1998.