YES! We must do this.
I would go farther and say that not only should the advertisers be boycotted, perhaps not in a “formal” way, but also those of us who support the constitution and freedom actively boycott all the left-wing media outlets including the major networks, the major newspapers that supported Obama and socialism, and all movies with leftist actors in major roles.
If they lose 48% of their audiences and subscribers they can not continue to spout their garbage. The Obamaites support alone will not sustain them!! Is there a web site that lists all the appropriate companies that support this nonsense so we can not buy their products or shop at their stores? I suspect we all know which actor’s movies to avoid - if I never see another George Clooney movie it will be too soon !!!!