Monkey Cage: “There are two reasons the blue shift exists and has become more prominent. First, the 2002 Help America Vote Act required states to institute provisional ballots for voters with a disputed registration status when they went to vote. Because voters who cast a provisional vote are more likely to be young and members of a racial or ethnic minority group, provisional ballots are disproportionately Democratic.”
“Second, Democrats are slightly more likely to vote by mail than Republicans. This is probably because Democratic campaigns are more likely to emphasize turning out supporters before Election Day than are Republican campaigns. Thus as these mail ballots are counted, the overall total will again lean Democratic.”
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