On 20 October the Cook Political Report, a non-partisan election forecaster, changed the rating of three US Senate races. South Carolina moved from Likely Republican to Lean Republican, and Mississippi from Solid Republican to Likely Republican. Both shifts favour Democrats.
Minnesota moved the other way, from Likely Democrat to Lean Democrat, because polling showed the Democratic nominee behind the national environment. A rating is a forecaster's judgement of how likely a party is to win, not a result.
Cook has been moving races for weeks. It moved 18 House races toward Democrats on 9 October and 11 more on 16 October. Axios reported that these moves put the likely outcome at Democrats picking up nine to 19 House seats. On 6 October Cook moved Kansas from Lean Republican to Toss Up, New Hampshire from Toss Up to Lean Democrat and North Carolina from Lean Democrat to Likely Democrat. Forecasts can be wrong, and the voters, not the forecasters, decide. On Cook's scale a Toss Up is a race either party could win, Lean means a narrow edge, Likely a clearer edge and Solid a safe seat.
The stakes are control of Congress. The 3 November midterm election, held halfway through a president's term, will decide whether Republicans keep their majorities in the House and the Senate. In Texas, Harris County reported more than 100,000 in-person votes on its first early-voting day. Texas had 911,468 early voters after two days, about 4.8% of its registered voters, and in South Carolina 97,968 votes were cast on day one, more than double the last midterm.
The United States holds an election on 3 November. It will decide who controls Congress.
On 20 October, a group called the Cook Political Report changed its guess for three Senate races.
It moved South Carolina and Mississippi toward the Democrats. It moved Minnesota toward the Republicans.
These are guesses, not results. Voters decide the winners. A forecaster looks at polls to make its guesses.