The Left loves to tout universal mail-in voting. Liberal enclaves like California, Hawaii, and Oregon have implemented it, while activists push aggressively to impose mail-in voting on Americans. But even as they push it, despite repeated instances of fraud, the Left simultaneously attacks any efforts to make vulnerable mail voting more secure. Indeed, the Left holds outright disdain for even minimal safeguards for mail ballots.
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I know a way to take care of mail-in voter fraud. Eliminate it, with very few exceptions such as working out of State, military members, and people that can't make it to the polls for medical reasons.