Former state Assembly Speaker Sheldon Silver's conviction on fraud, money laundering, and extortion was overturned Thursday.
The judge used a Supreme Court precedent involving former Virginia Governor Bob McDonnell, which more clearly defined the kind of conduct that could be considered corrupt while in office.
"The court talks about certain acts that Silver was shown to have taken that no longer can be considered official acts, such as having a meeting," attorney Joshua Colangelo-Bryan said.
"It is not clear beyond a reasonable doubt that a rational jury would have reached the same conclusion if properly instructed, as is required by the law for the verdict to stand," Jose Cabranes of the Second Circuit Court of Appeals decision said in his decision.
In a statement, acting U.S. Attorney Joon Kim says he will re-try the case.