The New York Times, CBS and Newsweek may have crossed that line already. All have conducted polls that exaggerate support for President Obama and his policies by blatantly manipulating the sampling:

The only consistent quality about the New York Times/CBS polling is its ridiculous sampling on party identification. Once again, the NYT/CBS poll tries to paint Democrats as unassailably popular and Republicans as losing ground, and once again they have to wildly oversample Democrats to make the argument. Their latest poll has a sixteen-point gap between the parties. …

Unfortunately, they’re not the only news agencies using ridiculous sampling to bolster their contentions of wild popularity for Barack Obama. Newsweek used a 19-point gap in its latest polling. CNN thus far has neglected to publish the internals of its poll. It’s just another round of dishonesty from the media.

When does systematic and intentional dissembling by the media become corruption?