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

Former Vice President Joe BidenJoe BidenMacro grid will keep the lights on Pelosi suggests filibuster supporters 'dishonor' MLK's legacy on voting rights Sanders calls out Manchin, Sinema ahead of filibuster showdown MORE has opened up a 9-point lead over President TrumpDonald TrumpSanders calls out Manchin, Sinema ahead of filibuster showdown Laura Ingraham 'not saying' if she'd support Trump in 2024 The Hill's 12:30 Report: Djokovic may not compete in French Open over vaccine requirement 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 GardnerEleven interesting races to watch in 2022 The Hill's Morning Report - Presented by Facebook - Biden to tackle omicron risks with new travel rules Gun control group alleges campaign finance violations in lawsuit against NRA MORE (Colo.), Joni ErnstJoni Kay ErnstAlabama GOP gears up for fierce Senate primary clash Biden's court picks face fierce GOP opposition Lawmakers in both parties to launch new push on Violence Against Women Act MORE (Iowa), Susan CollinsSusan Margaret CollinsVoting rights, Trump's Big Lie, and Republicans' problem with minorities More than 30 million families to lose child tax credit checks starting this weekend Sinema scuttles hopes for filibuster reform MORE (Maine), Steve DainesSteven (Steve) David DainesHillicon Valley: Amazon's Alabama union fight — take two Senate Judiciary Committee to debate key antitrust bill Overnight Defense & National Security — No punishments in botched Kabul drone strike MORE (Mont.) and Thom TillisThomas (Thom) Roland TillisSinema scuttles hopes for filibuster reform Republicans threaten floor takeover if Democrats weaken filibuster  Biden's court picks face fierce GOP opposition 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.