President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE is in a dead heat in Arizona in a head-to-head 2020 match-up with former Vice President Joe Biden Joe BidenThe Memo: Warning signs flash for Trump on debates Senate Republicans signal openness to working with Biden National postal mail handlers union endorses Biden MORE, according to a poll by the left-leaning Public Policy Polling.

Forty-six percent of respondents to the survey said they would vote for Biden in the match-up and 46 percent said that they would vote for Trump. Eight percent of those surveyed said they were "not sure."

Biden finished best in a head-to-head match-up among the top four Democratic contenders.

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Trump beat Sen. Bernie Sanders Bernie SandersSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Schumer, Sanders call for Senate panel to address election security MORE (I-Vt.) 47 percent to 46 percent; Sen. Elizabeth Warren Elizabeth WarrenNo new taxes for the ultra rich — fix bad tax policy instead Democrats back away from quick reversal of Trump tax cuts It's time for newspapers to stop endorsing presidential candidates MORE (D-Mass.) 47 percent to 45 percent and former South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq A socially and environmentally just way to fight climate change MORE 47 percent 44 percent.

Arizona last voted for a Democrat in a presidential election in 1996 when former President Clinton won the state. It has voted for the Republican candidate in 16 of the last 17 presidential elections.

None-the-less, the state, which has 11 electoral college votes, is viewed as a battleground state as the population increases and demographics have changed. Sen. Kyrsten Sinema (D-Ariz.) took office in 2019, becoming the first Democratic senator from the state since 1995.

The poll comes as Democrats' electability has become a central theme in the primary.

A Gallup poll in November showed that a majority of those who identify as Democrats thought that a candidate who can beat Trump is more important than a candidate who shares the same values as them.

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Biden has taken a moderate approach to the primary, targeting centrists and independents, while progressive heavyweights like Sanders and Warren have tried to appeal more to the Democratic base.

The Public Policy Polling survey also showed Sen. Martha McSally Martha Elizabeth McSallyKelly's lead widens to 10 points in Arizona Senate race: poll Senate Republicans scramble to contain fallout from Woodward bombshell Mark Kelly apologizes for offensive 2018 joke MORE (R-Ariz.) trailing Mark Kelly, a former astronaut running as a Democrat for the Arizona Senate seat McSally filled following the death of Sen. John McCain John Sidney McCainKelly's lead widens to 10 points in Arizona Senate race: poll COVID response shows a way forward on private gun sale checks Trump pulls into must-win Arizona trailing in polls MORE (R-Ariz.).

The Arizona primary is scheduled for March 17.

The PPP poll was a survey of 760 Arizona voters conducted Jan. 2-4.