Lawyers for former Senator John Edwards said his client committed "many sins but no crimes" and said the charges against him should never have been brought to trial.
Edwards was found not guilty of one count of campaign fraud, and the jury were unable to reach a verdict on the remaining five counts, forcing the judge to declare a mistrial.
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Some 50 million Facebook users are alleged to have had their personal details harvested by Cambridge Analytica.
Donald Trump's response to an investigation into Russian meddling in the 2016 election suffers a set back as his lawyer quits.
Theresa May accused Russia of a "brazen and reckless attack against the United Kingdom" as she arrived at the spring European Council.