Nearly 500,000 of the voters purged during the time period highlighted by Mr. Abbott were dead. About the same number were cleared after they were put on a list of people who did not vote in two successive general elections and are believed to have moved.
Those numbers were roughly equivalent to the number of voters in those categories removed in previous years.
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Mr. Abbott said around 1,900 possible noncitizens had a voting history in the state before their registrations were canceled. He said their records were being forwarded to the attorney general’s office for investigation.
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“In a two-year cycle, 10 percent of your roll could move,” even in an economic downturn, Mr. Bettencourt said. During a good economy, it could be even higher, he said.