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Vivek Ramaswamy's campaign produced a controversial ad in October that featured Amy Acton's estranged mother.

Arizona Gov. Katie Hobbs will win the governor's race, CBS News projects, besting Trump ally Rep. Andy Biggs.

The change in the balance of power sets up a clash with the Trump administration on oversight and other legislative priorities.

Rebecca Bennett defeated the two-term Republican incumbent after his monthslong absence for depression treatment.

In September, the House censured GOP Rep. Chuck Edwards over "inappropriate conduct" toward aides.

GOP Sen. Ashley Moody defeated Democrat Angie Nixon in the Florida Senate race, CBS News projects, keeping the seat under Republican control.

Democrat Roy Cooper defeated Michael Whatley in the North Carolina Senate race, CBS News projects, marking a flip for Democrats after GOP Sen. Thom Tillis opted not to seek reelection.

Democratic Rep. Chris Pappas defeated former GOP Sen. John Sununu in the New Hampshire Senate race, CBS News projects, keeping the seat in Democratic control.

Democratic Sen. Jon Ossoff defeated GOP Rep. Mike Collins in the Georgia Senate race, CBS News projects, holding onto his seat in the upper chamber.

President Trump remained optimistic about GOP chances ahead of polls closing: "We have a good chance. But we're not going to be embarrassed."