Sue the Bastard's?
The courts have made it fairly difficult for politicians to sue for libel, even in egregious cases. The rational is that allowing such suits to succeed would chill political discourse.
The rise of the Swift Boat Liars, and this years incarnation, William Simmons' American Issues Project shows the power of a couple of Texas Billionaires to corrupt the political process, and suggests that it might be time for the courts to revist the issue.
Having to pay out a billion or so in damages, and facing some time in the clink, even a billionaire might think twice before deciding to publish outrageous lies.