Democratic candidates in upcoming Senate races in Arizona and Nevada hold slight edges over their respective Republican opponents, a poll released Thursday found.

A poll conducted by Axios and SurveyMonkey found Rep. Kyrsten Sinema (D-Ariz.) leads each of her potential Republican opponents in the race to replace retiring Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style MORE (R-Ariz.).

In Nevada, Rep. Jacky Rosen Jacklyn (Jacky) Sheryl RosenHillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections Google, Apple, eBay to meet virtually with lawmakers for tech group's annual fly-in Senate Democrats demand answers on migrant child trafficking during pandemic MORE (D) holds a slight edge over incumbent Sen. Dean Heller Dean Arthur HellerOn The Trail: Democrats plan to hammer Trump on Social Security, Medicare Lobbying World Democrats spend big to put Senate in play MORE (R).

Both Arizona and Nevada are considered key states for Democrats if they hope to take control of the Senate.

The poll surveyed 1,667 registered voters in Arizona from April 2-23 about which candidate they would support in the Senate election. Fifty-one percent of voters said they would vote for Sinema over Rep. Martha McSally Martha Elizabeth McSallyTumultuous court battle upends fight for Senate Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee The Hill's Campaign Report: Biden goes on offense MORE (R) and former state Sen. Kelli Ward (R).

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Sinema has a wider margin over former Sheriff Joe Arpaio, with 61 percent of voters saying they’d vote for the Democrat in that hypothetical matchup, according to the poll.

The poll in Arizona has a margin of error of 4 percentage points.

McSally, Ward and Arpaio will face off in a primary on Aug. 28.

In Nevada, the poll found 50 percent of voters said they would vote for Rosen compared to 44 percent who said they would favor incumbent Heller, who is seeking his second term.

The poll surveyed 1,332 Nevada voters, and has a margin of error of 5 percentage points.

Republicans are bracing for potential losses in November's midterms, as the party in power typically loses some seats in Congress during midterm elections.

Democrats have been bolstered by a spate of recent victories in states and districts that previously voted for President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE by wide margins.