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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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Authorities concerned about cyberterror threat for election

CNN has learned that U.S. intelligence officials have picked up chatter about a possible Al Qaeda election day terror plot. CNN's Jim Sciutto reports.

Authorities concerned about cyberterror threat for election

CNN has learned that U.S. intelligence officials have picked up chatter about a possible Al Qaeda election day terror plot. CNN's Jim Sciutto reports.