I need help with the title. What does it mean?

Bite-sized campaigners

(An excerpt of an article)

...Politicians themselves are critical of the way in whih they feel the political agenda has shifted out of their control into the hands of the media manipulators and spin doctors.

"The risk we're running in our campaigns is that we've reached a stage where the media become part of the electoral process; they no longer report it, they become a part of the problem."