WASHINGTON (CNN)  -- The Supreme Court heard new arguments Wednesday in a dramatic case that started with a movie attacking Hillary Clinton -- but that could have far-reaching implications for U.S. elections. The campaign finance case before the court stems from a film critical of then-presidential candidate Hillary Clinton. "If you thought you knew everything about Hillary Clinton, wait till you see the movie," said an ad last year for "Hillary: The Movie," a scorching attack on the woman then running for president. Citizens United, the conservative group behind the film, promoted it as featuring 40 interviews -- a "cast to end all casts"-- and promised that if "you want to hear about the Clinton scandals of the past and present, you have it here! 'Hillary: The Movie' is the first and last word in what the Clintons want America to forget!"
@highlight
Federal court ruled that movie broke campaign ad laws
@highlight
Group behind film attacking Clinton said it was a documentary
@highlight
Can corporations be barred from giving to election campaigns?
@highlight
Supreme Court expected to rule in a couple of months
@placeholder argued that the movie was a documentary, not "electioneering communication."