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

Former Vice President Joe BidenJoe BidenDemocrats warn GOP will regret Barrett confirmation Trump campaign eyes election night party at his sold-out DC hotel Harris blasts GOP for confirming Amy Coney Barrett: 'We won't forget this' MORE has opened up a 9-point lead over President TrumpDonald John TrumpTrump admin to announce coronavirus vaccine will be covered under Medicare, Medicaid: report Election officials say they're getting suspicious emails that may be part of malicious attack on voting: report McConnell tees up Trump judicial pick following Supreme Court vote 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 GardnerDemocrats brace for nail-biting finish to Senate battle Trump expressed doubt to donors GOP can hold Senate: report The Hill's Campaign Report: 2020 spending wars | Biden looks to clean up oil comments | Debate ratings are in MORE (Colo.), Joni ErnstJoni Kay ErnstBiden to campaign in Iowa for first time since winning nomination The Hill's Morning Report - Sponsored by Facebook - Trump, Biden search for undecided voters in final stretch Biden seeks to close any path for Trump win in race's final days MORE (Iowa), Susan CollinsSusan Margaret CollinsHouse Judiciary Republicans mockingly tweet 'Happy Birthday' to Hillary Clinton after Barrett confirmation Barrett sworn in as Supreme Court justice by Thomas Roberts to administer judicial oath to Barrett Tuesday MORE (Maine), Steve DainesSteven (Steve) David DainesDemocrat trails by 3 points in Montana Senate race: poll Poll shows statistical tie in Montana Senate race Power players play chess match on COVID-19 aid MORE (Mont.) and Thom TillisThomas (Thom) Roland TillisTrump campaign asks Supreme Court to halt North Carolina absentee ballot plan White House to host swearing-in event for Barrett on Monday night Democrats brace for nail-biting finish to Senate battle 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.