Conservative public interest lawyers sent letters on March 24 giving the District of Columbia, Iowa and Colorado 90 days to prove they are taking steps to delete from their registration lists dead voters and former residents, or else face a lawsuit.

Judicial Watch said the District has more people registered to vote than the Census Bureau says would be eligible, based on age. Counties in Iowa and Colorado face the same situation — an indication, the conservative group said, that those jurisdictions need to clean up their rolls.

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