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Poll: Democrat Mark Kelly leads incumbent McSally in Arizona Senate race

Democratic candidate Mark KellyMark KellySenate rejects Cruz effort to block stimulus checks for undocumented immigrants The eight Democrats who voted 'no' on minimum wage Democratic centrists flex power on Biden legislation MORE is leading Republican Sen. Martha McSallyMartha Elizabeth McSallyGOP targets Manchin, Sinema, Kelly on Becerra House Freedom Caucus chair weighs Arizona Senate bid New rule shakes up Senate Armed Services subcommittees MORE among Arizona voters, according to a new poll. 

Kelly, a former astronaut and U.S. Navy captain, has a 4-point lead over the incumbent Republican, according to a poll by the left-leaning Public Policy Polling

The survey found that 46 percent of polled voters said they would vote for Kelly and 42 percent said they would vote for McSally. An additional 12 percent said they were not sure. 

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Kelly is married to former Rep. Gabby Giffords (D-Ariz.), who has been a prominent gun control advocate since retiring from Congress after surviving an assassination attempt in 2012.

Democrats are looking to flip at least three Senate seats in 2020 to take control of the upper chamber. 

McSally is one of a few vulnerable targets. The Cook Political report ranks the race as a “toss-up.” 

McSally was appointed to her seat last year after it was vacated following the death of Republican Sen. John McCainJohn Sidney McCainGraham: Trump can make GOP bigger, stronger, or he 'could destroy it' Former Trump Defense chief Esper to join McCain Institute We need an independent 1/6 commission that the whole country can have confidence in MORE. She had lost her Senate bid in 2018 to Democrat Kyrsten Sinema, who flipped the seat formerly held by retired Republican Sen. Jeff FlakeJeffrey (Jeff) Lane FlakeFormer GOP lawmaker: Republican Party 'engulfed in lies and fear' Grassley to vote against Tanden nomination Klain on Manchin's objection to Neera Tanden: He 'doesn't answer to us at the White House' MORE.

The Public Policy Polling survey polled 760 Arizona voters between Jan. 2 and Jan. 4. There is a margin of error of 3.6 percentage points.