There are still hundreds of thousands of votes to be counted in the last one percent of districts (including the very blue Tucson), with many speculating that the victor will not be named for several days.
Arizona's nationally-watched and incredibly tight Senate race between Republican Martha McSally and Democrat Kristin Sinema may not have a declared victor until Thursday or even next week because, ironically, the state's voters like to cast their ballots early.
"McSally, the Republican Party nominee, leads her Democratic challenger, Sinema, 49 percent to 48 percent in the latest poll to come out on Arizona's Senate election". As Tuesday night ticked toward Wednesday morning, the lack of an outcome began to settle in.
About three-quarters of Arizona voters cast ballots by mail.
That leaves the contentious Senate race a cliffhanger in what's otherwise shaping up to be another banner Arizona year for Republicans.
The avid triathletes are battling over the seat vacated by Sen. "So we've just got to make sure that we stop Kyrsten Sinema from being our next senator".
In Congress, McSally, 52, represents a moderate district based in Tuscon, voting in line with Trump almost 98 percent of the time, according to FiveThirtyEight data.
She's a former Green Party activist who transformed herself into a more centrist Democrat. More Arizona voters identify as Republican than as Democrat by 10 points.
McSally also accused Sinema of treason for an offhand comment in a 2002 radio interview with an anti-war talk show host who suggested hypothetically he might join the Taliban. She remained optimistic about a Sinema victory.
During her 2016 campaign to be re-elected to her Tucson area swing district House seat, McSally criticized Trump for attacking the parents of an Army captain killed in Iraq and for a videotape in which the future president bragged about sexually assaulting women.
Both Sinema (88 percent) and McSally supporters (88 percent) have a high degree of vote certainty, and equal numbers of Democrats (50 percent) and Republicans (50 percent) are extremely interested in the election.
"Arizona is such a Great State but it needs Border Security which [McSally] will provide, and Kyrsten Sinema doesn't even think about", Trump said in a tweet ahead of the election.
The Senate race will test that theory and may help determine whether Democrats target Arizona in the 2020 presidential election.