The database includes names, addresses, birth dates, party affiliations, phone numbers and emails of voters in all 50 U.S. states and Washington, researcher Chris Vickery said in a phone interview. While voter data is typically considered public information, it would be time-consuming and expensive to gather a database of all American voters. A trove of all U.S. voter data could be valuable to criminals looking for lists of large numbers of targets for a variety of fraud schemes.