That's interesting, but I'm not sure what it proves, other than that when you ask a journalist what his/her personal political philosophy is, that it skews liberal more than the self-assessment of the population. Doesn't really speak to what the media reports or how it reports it, other than the soft connotation that noone can ever be truly objective.
In any event, why is the comparison of the two Pew surveys thought to be so meaningful? From those numbers, I'd imagine that there's a gap between how people respond to the poll, and how they really behave.
Consider - only 20% of the public considers themselves liberal? Really? Sounds like 25 years hence, Reagan's tarring of the word still leaves that sticky residue.
IMHO, significant portions of the public are still wary of admitting in -- well, in public -- that they're liberal. Overeducated journalists may or may not have that same fear.
Gattigap