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

Former Vice President Joe BidenJoe BidenAtlanta mayor won't run for reelection South Carolina governor to end pandemic unemployment benefits in June Airplane pollution set to soar with post-pandemic travel boom MORE has opened up a 9-point lead over President TrumpDonald TrumpVeteran accused in alleged border wall scheme faces new charges Arizona Republicans to brush off DOJ concern about election audit FEC drops investigation into Trump hush money payments 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 GardnerBiden administration reverses Trump changes it says 'undermined' conservation program Gardner to lead new GOP super PAC ahead of midterms OVERNIGHT ENERGY: Court rules against fast-track of Trump EPA's 'secret science' rule | Bureau of Land Management exodus: Agency lost 87 percent of staff in Trump HQ relocation | GM commits to electric light duty fleet by 2035 MORE (Colo.), Joni ErnstJoni Kay ErnstConservative Club for Growth PAC comes out against Stefanik to replace Cheney A bipartisan effort to prevent the scourge of sexual assault in the armed forces Ernst defends Cheney, calls for GOP unity MORE (Iowa), Susan CollinsSusan Margaret CollinsCheney drama exposes GOP's Trump rifts House to advance appropriations bills in June, July Manchin touts rating as 'most bipartisan senator' MORE (Maine), Steve DainesSteven (Steve) David DainesHillicon Valley: DOJ to review cyber challenges | Gaetz, House Republicans want to end funding for postal service surveillance | TikTok gets new CEO Senators introduce bipartisan bill to protect personal travel data Wyden-Paul bill would close loophole allowing feds to collect private data MORE (Mont.) and Thom TillisThomas (Thom) Roland TillisSenate hears from Biden's high-profile judicial nominees for first time Senate Democrats take aim at 'true lender' interest rate rule Former North Carolina chief justice launches Senate campaign 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.