evidence: In U.S. criminal law, a jury needs to unanimously find a defendant guilty beyond a reasonable doubt. But, one expert argues the judge's jury instructions were not clear and could be grounds for appeal. "Although you must conclude unanimously that the defendant conspired to promote or prevent the election of any person to a public office by unlawful means, you need not be unanimous as to what those unlawful means were," Judge Juan Merchan told the jury. [...] "They were told that they have to be unanimous as to this underlying crime of promoting or preventing an election through unlawful means. What they don't have to be unanimous on is what those unlawful means were -- and that is not an element of the statute itself," Bader said.