Because voter fraud is exceedingly rare in the US. Now election fraud is a different issue.
I dont get how people can just shrug off reports of dead people and non-citizens being registered to vote as a non-issue.
How many of those dogs registered to vote showed up and cast a ballot?
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If anyone actually cares enough to have a mostly accurate cost effective voter registration database, they'd reuse any one of our existing national demographic databases. But they don't. Because the recurring drama caused by our existing fragmented poorly funded more error prone system is too useful.