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An 'I Voted" sticker is worn by man who cast a ballot in the Virgina Super Tuesday primary March 1, 20116 in Washington, DC.
Americans began voting in the crucial Super Tuesday primaries and caucuses in what is deemed the most critical day in the presidential nominating process. The first state to open its polling stations was Virginia at 6:00 am (1100 GMT). A total of 12 states from Alabama to Alaska are holding primaries or caucuses on Tuesday, with frontrunners Hillary Clinton and Donald Trump hoping to finish off their challengers.
An 'I Voted" sticker is worn by man who cast a ballot in the Virgina Super Tuesday primary March 1, 20116 in Washington, DC.
Americans began voting in the crucial Super Tuesday primaries and caucuses in what is deemed the most critical day in the presidential nominating process. The first state to open its polling stations was Virginia at 6:00 am (1100 GMT). A total of 12 states from Alabama to Alaska are holding primaries or caucuses on Tuesday, with frontrunners Hillary Clinton and Donald Trump hoping to finish off their challengers.

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New CNN polls show Clinton, Trump in tight races in NV, NC and Ohio. CNN's John King zeros in to show why.

New CNN polls: Trump, Clinton in tight swing state races

New CNN polls show Clinton, Trump in tight races in NV, NC and Ohio. CNN's John King zeros in to show why.