How many other Dan Rathers and Jayson Blairs are there who simply haven't been caught inventing facts yet?

Libs are forced to try to discredit FOX News because it brings stories to light they'd rather see squelched. But it's easy to come up with ten times the number of factual reporting errors in the MSM than at FOX, and there's many stories, like the Acorn scandal for example, that they would completely bury if FOX didn't report it. Do libs really think they can convince anyone the MSM doesn't lie?