PHOENIX – Latest polling numbers released from the Secretary of State’s office shows Kyrsten Sinema has taken a slight lead over Martha McSally in the race for Arizona Senate.

As of 6:30 p.m. Thursday, Sinema has 932,870 votes statewide, while McSally has 923,260.

RESULTS: Track AZ election results here

345,000 votes remain uncounted in Maricopa County while a small number of ballots remain uncounted as well in smaller counties.

Officials estimate about 195,000 of those are early ballots, provisional, and out-of-precinct ballots that voters cast or dropped off on Election Day.

Arizona Election 2018: 2 races with results too close to call

It is one of the most-watched races across the country: will Martha McSally, a Republican, or Kyrsten Sinema, a Democrat, serve as Arizona’s first female senator?

Both are vying to fill Sen. Jeff Flake’s seat after Flake’s announcement in 2017 that he would not seek re-election.

As preliminary results started to come in Tuesday evening, the two appeared to be in a dead heat with both flip-flopping for the lead.

Maricopa County Recorder Adrian Fontes expects ballot counting to continue for several days. Officials will continue to update the results daily at 5 p.m.