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Barry Burden, a political-science professor at the University of Wisconsin-Madison, said he doesn’t buy the argument that same-day voting is more susceptible to fraud, but he acknowledged that it can lead to more hectic atmospheres at polling precincts.

“In my mind, registration at polls is more secure and has more integrity than registration at a third-party place,” he said. “But especially when this is done by paper, there’s just a lot of paper to process in a short period of time.”