The President’s pubic rebuke of a Supreme Court decision was a rare moment, but should indicate the egregiousness of the court’s action:

The core of the Citizens United decision said corporations have a First Amendment right to make independent expenditures in candidate elections. Only a constitutional amendment, which is exceedingly unlikely, could undo that core holding.

via Washington Memo – Supreme Court Gets a Rare Rebuke, in Front of a Nation – NYTimes.com