"Never pick a fight with people who buy ink by the barrel"

This quote by William J. Clinton is a warning to not begin a battle with people who have a lot of influence. The expression "get ink by the barrel" is a metaphor for having a great deal of cash and also power. It is referring to the media, who have the ability to shape public opinion and also influence the public's sight of an individual or situation. By beginning a fight with the media, one dangers having their reputation tainted as well as their trustworthiness questioned. Therefore, it is best to stay clear of battle with those that have the power to shape public opinion. This quote functions as a tip to be mindful of the power of the media and also to reconsider before participating in a fight with them.