Democratic Senate candidate Mark Kelly (D) has a 12-point lead over Sen. Martha McSally Martha Elizabeth McSallySenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (R-Ariz.) in the Arizona Senate race, according to a Univision poll released Friday.

Kelly, a former astronaut, is challenging McSally, who lost the general election in 2018 to Sen. Kyrsten Sinema (D). McSally was later appointed to the Senate to succeed interim Sen. Jon Kyl (R), who filled Sen. John McCain John Sidney McCainMcSally says current Senate should vote on Trump nominee Say what you will about the presidential candidates, as long as it isn't 'They're too old' The electoral reality that the media ignores MORE's (R) seat following his death in 2018.

In the Univision poll, Kelly earned 48 percent support among registered voters, while McSally earned 36 percent support. Kelly polled significantly better than his opponent among Latino and black voters.

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However, the Univision poll isn't the first sign of an uphill battle for McSally. A poll released earlier this week by OH Predictive Insights, a Phoenix-based polling firm, showed Kelly with 49 percent support among Arizona voters, compared with 42 percent for McSally.

Arizona, a key state that went to President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE in 2016, also appears to be leaning Democratic in the lead up to the 2020 presidential election.

When given the choice between former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE and Trump, 50 percent of respondents chose Biden and 42 percent chose Trump. In a head-to-head against Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.), the other Democratic presidential front-runner, 48 percent chose the Vermont senator over the president.

Both Biden and Sanders received support from more than 60 percent of Latinos and more than 70 percent of black voters.

When given the option to chose between Trump and whomever wins the Democratic nomination, 51 percent of voters said they would support the Democratic nominee and 41 percent supported Trump.

The poll surveyed 1,036 likely voters in Arizona and has a 3 percent margin of error.