Democrat Kyrsten Sinema has the lead in District 9, against Republican Vernon Parker for the newly created congressional seat.
She has a 1 percent lead with all precincts reporting.
Sinema worked hard all day long trying to get those last minute voters to the polls. She says she is feeling excited and optimistic.
Sinema was on the phone calling voters reminding them to head to the polls. She also canvassed with volunteers, going door-to-door.
The race between Sinema and Parker and has been pretty nasty. We've seen attack ad after attack ad.
Sinema says despite those negative ads, she's got this.
"I come from a family that struggled hard to make it to the middle class so I get up each day and think about how to fight for those families, veterans, seniors, small business owners. My opponent wants to give tax breaks to millionaires and billionaires, that just not what we need," said Sinema.
Sinema will have her campaign party at the Renaissance Hotel in downtown Phoenix as she watches the results come.
If she is elected, she'll make history. She'll be the first openly bisexual member of congress.
Vernon Parker also tried to connect with voters one last time before they choose a congressional representative.
Parker said despite the overwhelming negative tone of this race, his supporters are upbeat and enthusiastic this election day.
"People you know driving down the street they're just like, they're honking their horns they're waving at us, they're giving us a thumbs up. One guy stopped his car and jumped out and shook my hand so it's going to be fun," said Parker.
Super Pacs poured outside money into this race.
Parker and Sinema were locked in a near-dead heat as ballots were counted. Sinema was ahead by just 1 percentage point with 60 percent of the precincts reporting. As of 10 p.m., only 1,000 votes separated Sinema and Parker. Looks like this race will be close down to the end.
"In our campaign we refused to get into the gutter, we don't engage in that kind of nasty campaigning, we stayed above board and talked about positive vision for the future, and we believe that's what voters are interested in," said Sinema Tuesday night.
"It would be nerve wracking had we not put everything into this race," said Parker Tuesday night. "We did everything we had to do, win lose or draw I feel very proud of the effort our team put forth."
District 9 covers much of Tempe and parts of Phoenix, Scottsdale, Paradise Valley, Mesa and Chandler.
Parker has weathered Democratic criticism that he's a tea party radical who will hurt children by cutting the federal education department. Sinema has been called a radical too liberal for the newly created district who doesn't understand stay-at-home moms.
Republicans have a slight registration advantage but both parties' totals are exceeded by independents.
Video: FOX 10's Mia Garcia and Dan Spindle have team coverage.