Since Staples is going to continue to advertise on other programming perhaps they are playing the ratings game?? It is no secret that network and news slots pull a smaller rating than other programming. So before we jump the gun and assume Staples is pulling out sponsorship of news programming because of political philosophy is perhaps premature.
I am sure there are other advertisers who may benefit from the slot available so I don't see Sinclair broadcasting going down the tubes. Advertisers continually tweak their ads to try to get the most benefit for their buck. I detect paranoia on the part of a few ultra conservatives who fear someone may be stealing their thunder. We shall see.