Although I know both parties have done it, the Democrats, or the left, are more known for voter fraud (e.g. Chicago, Jackson's spoils system, etc). They're better at gaming the system. It's also more of a "leftist" issue because the people who would be discouraged by this are more likely to vote Democrat and/or receive public assistance. In both cases, the Democrat Left wouldn't benefit as much, or have their influence decrease, as a result of such a law.
There are also a lot of people that genuinely believe this would disenfranchise the poor or cause them additional, if minor, financial and personal hardship. Those tend to be to the left as well.
It is a sane/loonie issue, but the effects affect each side differently.
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