Look at it this way, if campaigns are pumping money into a media outlet it's just possible that outlet will make favorable editorial decisions regarding the cash cow.
Do you have some proof that major news outlets slant their endorsements and favorable coverage based on how much ad space is purchased?
If the media outlet has to make money the old fashioned way then they will need to scoop the competition whether that fits their personal biases or not.
I favor supply and demand as a means of driving business decision making.
Giving candidate x money is not the same as placing your thoughts in the hands of anyone. It just lowers your bank account and raises theirs.
Giving a candidate money is the same as making a political statement. It should be, and is, protected free speech.