They can tell by what precincts the ballots are coming from
Posted on: October 23, 2016 at 21:18:18 CT
SparkyStalcup MU
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They don't identify the individual voters, but if there are an increase in early ballots from precincts that went Obama in 2012, they infer that the early voting is going well for Clinton (assuming that precincts Romney won aren't returning early ballots as well as they did in 2012)