Do you understand what "mainstream" is supposed to mean?
Is it reasonable that major news organizations, theoretically objective, should be aghast at any examination of Obama's personally spending, by choice, twenty years in a radical church, but at the same time figure that the history of Romney's church a century before he was even born is somehow important?
Doesn't this strike you as just a little bit nuts?
Just acknowledge that there's a "left wing media" to go along with the "right wing media," and that the former vastly outnumbers the latter, and we can go on from there.