One data source is a list of voter names sorted by the order in which they voted. The second data source is the ES&S iVotronic list of what votes were cast with a time stamp down to a fraction of a second. If you combine the two, you can get a pretty high degree of accuracy in terms of deciding who voted for whom. (It's not perfect because someone could have let another person in front of them in line after they signed in, but that would just cause a two-person error in estimation.)
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