His voting for the Voter’s Right Bill is in hundreds of articles.
https://www.nytimes.com/2021/09/18/opinion/sunday/manchin-vote-voting-bill.html
https://www.theguardian.com/us-news/2021/jun/06/joe-manchin-opposes-for-the-people-act-democrats-voting-rights
Joe Manchin Dealt Mortal Blow To Voting Rights Legislation He Killed Build Back Better.
https://www.newsweek.com/joe-manchin-dealt-mortal-blow-voting-rights-legislation-he-killed-build-back-better-1660958