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

Democratic candidate Mark Kelly is leading Republican Sen. Martha McSallyMartha Elizabeth McSallyDemocrats feel political momentum swinging to them on impeachment Senate Republicans confident they'll win fight on witnesses How Citizens United altered America's political landscape 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 McCainSchiff shows clip of McCain in Trump impeachment trial Martha McSally fundraises off 'liberal hack' remark to CNN reporter Meghan McCain blasts NY Times: 'Everyone already knows how much you despise' conservative women 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 FlakeThe Hill's 12:30 Report: House managers to begin opening arguments on day two Flake: Republicans don't speak out against Trump 'because they want to keep their jobs' GOP senator calls CNN reporter a 'liberal hack' when asked about Parnas materials 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.