From left, Democratic presidential candidates former Virginia Sen. Jim Webb, Sen. Bernie Sanders of Vermont, Hillary Clinton, former Maryland Gov. Martin O'Malley and former Rhode Island Gov. Lincoln Chafee listen to the National Anthem before the CNN Democratic presidential debate on Tuesday in Las Vegas.
From left, Democratic presidential candidates former Virginia Sen. Jim Webb, Sen. Bernie Sanders of Vermont, Hillary Clinton, former Maryland Gov. Martin O'Malley and former Rhode Island Gov. Lincoln Chafee listen to the National Anthem before the CNN Democratic presidential debate on Tuesday in Las Vegas. John Locher AP
From left, Democratic presidential candidates former Virginia Sen. Jim Webb, Sen. Bernie Sanders of Vermont, Hillary Clinton, former Maryland Gov. Martin O'Malley and former Rhode Island Gov. Lincoln Chafee listen to the National Anthem before the CNN Democratic presidential debate on Tuesday in Las Vegas. John Locher AP

Factchecking the Democratic debate

October 14, 2015 02:04 PM

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  • How Russian bots and trolls invade our lives — and elections

    How do bots and trolls work to infiltrate social media platforms and influence U.S. elections? We take a closer look at these insidious online pests to explain how they work.