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A man walks to use a voting booth March 1, 2016, at one of the Virginia primary election polling stations at Colin Powell Elementary School, in Centreville, Virginia.
Voters in a dozen states will take part in "Super Tuesday" -- a series of primaries and caucuses in states ranging from Alaska to Virginia, with Virginia the first to open its polling stations at 6:00 am (1100 GMT).  / AFP / PAUL J. RICHARDS        (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)
A man walks to use a voting booth March 1, 2016, at one of the Virginia primary election polling stations at Colin Powell Elementary School, in Centreville, Virginia.
Voters in a dozen states will take part in "Super Tuesday" -- a series of primaries and caucuses in states ranging from Alaska to Virginia, with Virginia the first to open its polling stations at 6:00 am (1100 GMT).  / AFP / PAUL J. RICHARDS        (Photo credit should read PAUL J. RICHARDS/AFP/Getty Images)

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    Study: Voter fraud is rare

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Study: Voter fraud is rare

Donald Trump ramps up claims of a rigged election, but a study finds very few cases of voter fraud between 2000 and 2011.

Study: Voter fraud is rare

Donald Trump ramps up claims of a rigged election, but a study finds very few cases of voter fraud between 2000 and 2011.