Here's evidence that the decision in Citizens United v the FEC is leading to increased spending on elections, as critics suggested: The rise of "super PACs."
A political action committee is simply a private organization that collects money and uses it to influence elections. Until the Citizens United decision these organizations were regulated and limited to some degree. Now, they've exploded in influence and size. Many of the contributions are undisclosed, leading critics to argue that they facilitate corruption by making it difficult to determine who is financing whom and what favors might be received for political support.
