Yes there is media bias. Here's an example.
http://www.dailykos.com/story/2012/...sclosure-10-Op-Ed-Writers-Are-Romney-Advisers
http://mediamatters.org/blog/2012/09/19/nine-wall-street-journal-op-ed-writers-who-were/189979
http://www.dailykos.com/story/2012/...sclosure-10-Op-Ed-Writers-Are-Romney-Advisers
http://mediamatters.org/blog/2012/09/19/nine-wall-street-journal-op-ed-writers-who-were/189979