Well, just in case she's reading (Hi, Joanne! I'm the guy you refer to as "the gun nut!"), here's an excellent explanation on the mechanics of media bias from The Weekly Standard:
"The bottom line from the Groseclose-Milyo study is that the political slant of most of the mainstream media is far to the left of the typical member of Congress. Thus, if the political opinions of viewers, listeners, and readers are similar to those of their elected representatives, the political leanings of most of the media are far to the left of those of most of their customers. This mismatch suggests profit opportunities for conservative-oriented, or at least balanced, media outlets. Fox News is probably only the beginning. Maybe the next conservative entrant will be a recreated CBS News."