No they can't, look up the communications decency act. If you make yourself a virtual town square then you have no right to regulate someones free speech.
This is not about political bias, it is the complete CENSORSHIP and DEPLATFORMING of people they deem hold "extremist views". Bing does not hold anywhere NEAR the ad market or has the reach of Google or Facebook.
Again facebook and google have the ability to topple governments. How do you think Arab Spring got started?
This is why conservatives will lose, most of them are completely clueless about how social media and the internet affects the real world.
You think Google and Bing are just like a Supermarket A and Supermarket B and the "free market" will decide. Thats not how tech monopolies work.
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