Arizona Sen. Mark Kelly and GOP challenger Blake Masters clashed Thu. in their first and only debate before Election Day.

Arizona will be at the center of the political universe this Nov.: the race could decide the Senate majority in 2023.

Kelly flipped the seat in a special election in 2020, winning by 2.6 points. He's now running for a full six-year term.

Challenging Kelly for the seat is Republican Blake Masters, the former president of the Thiel Foundation.

Libertarian candidate Marc Victor also participated in Thu.'s hourlong debate.

Thu. night was largely about Masters and Kelly: the two tussled over everything from water resources to abortion.

Masters opened the debate accusing Pres. Biden of wasteful spending, comparing him to a "drunken sailor."

Victor: "Drunken sailors, there's a limit to how much money a drunken sailor can spend."

Immigration loomed large over Thu.'s debate: per an Oct. YouGov poll, 65% of Arizonans say the issue is "very important."

Kelly said he supported a pathway to citizenship for Dreamers across the country.

All three candidates were asked about their stances on abortion access: Kelly said he would codify Roe v. Wade.

Arizona in Sept. banned all abortions with no exceptions for rape after a judge resurrected the state's 1864 ban. (WaPo)

Masters said Thu. that he supported the state's 15-week ban that was due to go into effect before the judge's ruling.

Masters also voiced support for Sen. Lindsey Graham's national 15-week abortion ban: "I believe in limits."

Masters was asked Thu. night whether he believed Pres. Biden was "legitimately" elected. His response:

Both candidates agreed on one issue: enacting a voter ID law.

Who is favored to win this Nov.? Per FiveThirtyEight's poll average, as of Thu., Kelly is leading Masters by six points.

The deadline to register to vote in Arizona is Oct. 11. Early voting begins Oct. 12.