Study shows media favored Romney over Obama during the Primaries

Of course they're not running against each other yet.

I think the author of this piece, Howard Kurtz, is pretty reliable.

Forget liberal bias. A new study reveals that the press covered Romney twice as favorably as Obama during the primaries

Ahhh, but the reason for the negative treatment was that the media was reporting what the Primary candidates were saying - which is of course attacking Obama.