Truer words were never spoken:
[T]he Obama administration ... has brought more prosecutions against current or former government officials for providing classified information to the media than every previous administration combined. [...] Mr. Corallo, who served under Mr. Bush’s attorney general John D. Ashcroft, said he was “sort of shocked” by the volume of leak prosecutions under President Obama. “We would have gotten hammered for it,” he said.
The lesson: if you're going to leak information, do it while a Republican is president.
CLARIFYING: Since 100% of the people I've asked have given this a reasonable interpretation that's not the one I intended: not because a Democrat is more likely to prosecute you, but because when you're prosecuted you'll have that many fewer people on your side. As inspiring as the support for Bradley Manning has been, imagine what it would have looked like if he'd been thrown in prison and given the full torture-that-leaves-no-marks treatment by Bush instead of Obama. The moral cretins who rationalize away their selective lionization by convincing themselves that Manning's no Daniel Ellsberg are right in one sense, anyway: Ellsberg had the good fortune to be persecuted by a Republican.