Biden opens 9-point lead over Trump in Senate battlegrounds: poll

Former Vice President Joe BidenJoe BidenLifting our voices — and votes Longtime Democratic pollster: Warren 'obvious solution' for Biden's VP pick Biden will help close out Texas Democrats' virtual convention: report MORE has opened up a 9-point lead over President TrumpDonald John TrumpTrump marks 'very sad milestone' of 100K coronavirus deaths DOJ: George Floyd death investigation a 'top priority' Lifting our voices — and votes MORE in six states where Republican senators face difficult reelection battles this fall, according to a new poll.

The survey from Hart Research Associates finds Biden at 50 percent and Trump at 41 percent among voters sampled in Arizona, Colorado, Iowa, Maine, Montana and North Carolina.

Trump won four of those states in 2016, with the exception of Maine and Colorado. All six states feature vulnerable GOP incumbents: Sens. Marth McSally (Ariz.), Cory GardnerCory Scott GardnerThe Hill's 12:30 Report - Presented by Facebook - Cuomo rings the first opening bell since March The Democrats' out-party advantage in 2020 The 10 Senate seats most likely to flip MORE (Colo.), Joni ErnstJoni Kay ErnstThe Hill's Coronavirus Report: National Portrait Gallery's Kim Sajet says this era rewiring people's relationship with culture, art; Trump's war with Twitter heats up The Hill's 12:30 Report - Presented by Facebook - Cuomo rings the first opening bell since March House Democrats make initial ad buys in battleground states MORE (Iowa), Susan CollinsSusan Margaret CollinsTrump administration gives renewables more time to take advantage of tax credits Soured on Fox, Trump may be seeking new propaganda outlet The Hill's Coronavirus Report: Former NIC Director Greg Treverton rips US response; WHO warns of 'immediate second peak' if countries reopen too quickly MORE (Maine), Steve DainesSteven (Steve) David DainesPelosi pulls vote on FISA bill after Trump veto threat FISA 'reform': Groundhog Day edition Hillicon Valley: House FISA bill in jeopardy | Democrats drop controversial surveillance measure | GOP working on legislation to strip Twitter of federal liability protections MORE (Mont.) and Thom TillisThomas (Thom) Roland TillisTrump administration gives renewables more time to take advantage of tax credits Tillis campaign releases first general election TV ad emphasizing 'humble' roots The Hill's 12:30 Report - Presented by Facebook - Cuomo rings the first opening bell since March MORE (N.C.).

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The poll found the Democratic challengers leading the Republican incumbents by a margin of 46 to 41. Republicans currently hold 53 seats in the Senate, meaning Democrats need to flip four to win back a majority.

The survey was conducted to measure voter appetites for mail balloting during the coronavirus pandemic.

Trump and some Republicans have been resistant to the idea, warning mail voting is susceptible to fraud.

The poll found broad support for voting by mail, with 85 percent of voters in the six battlegrounds saying there should be a mail option because of the pandemic.

Eighty-three percent of voters said they support congressional action to expand access to mail balloting, including 67 percent of Trump supporters. There is near-universal support for mail balloting among Democrats.

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Fifty-six percent of voters who said they plan to support the GOP senator up for reelection said the incumbent should support a vote-by-mail option.

If the GOP senator opposed legislation to expand mail-in balloting, 62 percent of voters said they would view the decision unfavorably, and 90 percent said they believe the decision would have been driven by politics.

Fifty-nine percent of voters overall said they do not believe that mail-in balloting is subject to fraud or corruption.

The Hart Research survey was conducted on behalf of the Democracy For All 2021 Action campaign. The survey of 805 likely voters in the six states has a 3.5 percentage point margin of error.