Just to demonstrate my above point, here are five states' worth of voting data including names, birth dates and whatever else you would need to make use of this breach. Obviously if this breach is exactly as dangerous as described, don't tamper with federal websites.
Vulnerable federal websites
Kansas: https://myvoteinfo.voteks.org/VoterView
Virginia: https://vote.sos.ri.gov/Home/UpdateVoterRecord?ActiveFlag=0
Wisconsin: https://myvote.wi.gov/en-us/MyVoterInfo
Minnesota: https://mnvotes.sos.state.mn.us/VoterStatus.aspx
According to /pol/ screenshots, possibly California?
Voter database leaks
https://raidforums.com/Thread-Kansas-2018-Voter-Database-Leaked-Download
https://raidforums.com/Thread-California-Birth-Index-1905-1995-Leaked-Download
https://raidforums.com/Thread-Washington-2018-Voter-Database-Leaked-Download
https://raidforums.com/Thread-Washington-Voter-Database-Leaked-Download
https://raidforums.com/Thread-Oregon-2018-Voter-Database-Leaked-Download
Vulnerable federal websites
Kansas: https://myvoteinfo.voteks.org/VoterView
Virginia: https://vote.sos.ri.gov/Home/UpdateVoterRecord?ActiveFlag=0
Wisconsin: https://myvote.wi.gov/en-us/MyVoterInfo
Minnesota: https://mnvotes.sos.state.mn.us/VoterStatus.aspx
According to /pol/ screenshots, possibly California?
Voter database leaks
https://raidforums.com/Thread-Kansas-2018-Voter-Database-Leaked-Download
https://raidforums.com/Thread-California-Birth-Index-1905-1995-Leaked-Download
https://raidforums.com/Thread-Washington-2018-Voter-Database-Leaked-Download
https://raidforums.com/Thread-Washington-Voter-Database-Leaked-Download
https://raidforums.com/Thread-Oregon-2018-Voter-Database-Leaked-Download


