In the Arizona Senate race, where the margins were not expected to be nearly as close as they were, ABC News reports that Democrat Ruben Gallego is projected to defeat Republican Kari Lake 50% to 48%, with 93% expected vote reporting.
Gallego, a five-term congressman who was favored to win the race, will replace independent Kyrsten Sinema, who held the seat and did not seek reelection.
Gallego, an Iraq veteran, ran on protecting abortion access, housing affordability and supporting Arizona's water supply.
MORE: Senate leadership race heats up as Trump issues demandsMeanwhile, Lake, a former newscaster, ran heavily on securing the border and is a fierce ally and supporter of President-elect Donald Trump.
Lake ran and lost her gubernatorial race for Arizona during the 2022 midterms and still has not acknowledged that she lost the race against the state's current governor, Democrat Katie Hobbs.
Lake has struggled with moderate Republicans in the state, and her problems worsened when she attacked the late Sen. John McCain and then Gov. Doug Ducey.
MORE: Trump expected to select Sen. Marco Rubio for secretary of state: SourcesDuring his Senate run, Gallego has downplayed his progressive record in Congress and will now be Arizona's first Latino U.S. senator.
Only one Senate race remains outstanding in the battleground state of Pennsylvania.
The current makeup of the Senate is 47 Democratic members and 52 Republicans.