Arizona's tight Senate race likely will not be called until later this week, since there are over 1 million outstanding early voting ballots that still must be counted, CBS News' Fin Gomez reports. As of early Wednesday, McSally had a lead of about 13,000 votes with 63 percent of the precincts reporting.
No matter who wins, Arizona will have its first female senator in history.
The candidates courted swing voters as they vied to replace Republican senator and frequent Trump critic Jeff Flake. Flake has said his brand of Republicanism simply isn't viable anymore in today's polarized political climate.
By October, Sinema had raised roughly $18.9 million, edging out McSally's $16.1 million.
But the milestone of electing the state's first female senator isn't that important to all voters. A recent CBS News poll showed more than half of Democrats are excited about the state electing its first female senator, but most Republicans say it doesn't matter.