Democratic 2020 White House hopefuls Joe Biden Joe BidenBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Joe Biden should enact critical government reforms if he wins MORE and Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE are in a statistical dead heat with President Trump among Arizona voters, according to a new poll.

In a mock-up general election, Biden has 44 percent support compared to Trump’s 46 percent, according to the OH Predictive Insights poll released Monday.

Buttigieg has 43 percent support compared to Trump’s 45 percent. Both of Trump’s narrow 2-point leads against the Democrats are within the 3.9 percentage point margin of error.

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The results show a decrease in support for the former vice president, who led Trump 49 percent to 44 percent in the state based on a May poll.

But Buttigieg, the mayor of South Bend, Ind., has increased his support 6 points, up from 37 percent when he was polled against Trump in May to meet Biden at the top of the field when placed against the president.

Sen. Bernie Sanders Bernie SandersTrump, Biden will not shake hands at first debate due to COVID-19 Sanders tells Maher 'there will be a number of plans' to remove Trump if he loses Sirota reacts to report of harassment, doxing by Harris supporters MORE (I-Vt.) saw a slight decrease in support, based on the poll. Sanders had 34 percent compared to Trump’s 47 percent in the latest poll, down from his 37 percent compared to Trump’s 46 percent in May.

Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) polled about the same as she did in May, decreasing 1 point from 42 percent to 41 percent compared to Trump’s stagnant 47 percent when polled against the senator.

This month’s poll also tested former New York City Mayor Michael Bloomberg Michael BloombergBloomberg rolls out M ad buy to boost Biden in Florida Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Bloomberg pays fines for 32,000 felons in Florida so they can vote MORE, a late-entry candidate who had 40 percent support compared to Trump’s 47 percent in the mock up poll.

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Trump’s level of support remained within a 45–47 percent range when matched against any of the five candidates surveyed, while the Democrats' support ranged from Sanders’s 34 percent to Biden’s 44 percent.

Trump’s support could give him a second win in Arizona in 2020, according to pollsters.

“No Democrat has earned more than 47 percent in a presidential election here since LBJ in 1964, but given this president’s apparent ceiling, that might just be enough to win when November rolls around,” said Jacob Joss, an OH Predictive Insights data analyst.

The Arizona Democratic presidential primary will be held on March 17.

The survey was conducted from Dec. 3 to 14. The sample size was 628 completed surveys. The sample demographics accurately reflected party affiliation, gender, region and age, according to OH Predictive Insights.