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It can certainly order recounts, or even annul the vote, of specific polling stations, though it is not clear whether it could order a total recount or annul the election entirely.
ECONOMIST: Mexico's elections
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The smartphone app hosts many additional features such as: voter registration information, voter specific polling place information, sample ballots, access to Associated Press real-time election coverage, videos, candidate and local ballot initiative information, and election results.
ENGADGET: AT&T launches VoteHub, brings the presidential election to your pocket
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Twitter attributes some of this to the differences between ongoing conversations (Twitter) and specific responses to specific questions (traditional polling).
CNN: How do you feel about Romney and Obama? Ask the 'Twindex'