In the Citizens United case Supreme Court concluded that corporate donations amount to protected free speech but did not address whether the same holds true for foreign corporations. I agree w/ Justice John Paul Stevens who had said "It will be necessary to explain why the First Amendment provides greater protection of some nonvoters than to that of other nonvoters" .
http://www.npr.org/2012/05/29/153914560/big-money-and-the-ballot-box?sc=tw
Get Big Money Out of the Election Ballot Boxes!