Arizona Democratic Senate candidate Kyrsten Sinema suddenly took a narrow 9,600-vote lead over GOP opponent Martha McSally late Thursday, with some 400,000 votes left to count in a closely-watched race that will determine the size and influence of the Republican Senate majority in January.
Sinema now has 932,870 votes statewide, while McSally has 923,260 and Green Party candidate Angela Green currently has 43,838, according to results provided by election officials at 8 p.m. EST.
"With half a million ballots left to count, we remain confident that as votes continue to come in from counties across the state, Martha McSally will be elected Arizona's next Senator," McSally campaign head Jim Bognet said.
The Green Party candidate, who dropped out of the race before Election Day and threw her support behind Sinema, is facing accusations of playing a potential "spoiler" role in the contest.
Arizona GOP officials sent mailers to Democratic voters during the campaign that highlighted Green's liberal views and tied her to Vermont Sen. Bernie Sanders., in a roundabout bid to convince them to support her instead of Sinema.