Meanwhile, a conservative group called True the Vote has sparked fears of voter intimidation with its vow to train thousands of volunteers to challenge any "suspicious" people at the polls as they seek to ferret out voter fraud.

While tossing out voter registration forms is a serious problem, many dirty tricks don't have much of an impact on the outcome, according to elections expert Rick Hasen of the University of California, Irvine.

"What is likely to have a larger impact is changes in laws, especially laws passed by Republican legislatures, which have the potential to moderately suppress Democratic turnout such as cutting back on early voting, making registration more difficult and voter ID laws," said Hasen.

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