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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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    US officially blames Russia for political hacks

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US officially blames Russia for political hacks

The Obama administration says it is confident that Russia is behind a series of recent email hacks intent on disrupting the November election. CNN's Jim Sciutto reports.

US officially blames Russia for political hacks

The Obama administration says it is confident that Russia is behind a series of recent email hacks intent on disrupting the November election. CNN's Jim Sciutto reports.