The truth is, there's actually a huge amount of centrist in the USA. Those centrists are reasonable people. They'll hear you out, think, analyze and make up their mind. They'll accept compromise, and they'll try hard to see if maybe there's truth to consider, even if most things said appears exaggerated, or ridiculous.
And then there's unreasonable people. They don't want to think, or consider options.
In the USA, if you are unreasonable, you're most likely on the right. Most reasonable people are clustered with the left. And a minority of unreasonable people are also on the left, with another minority of reasonable people clustered on the right.
Effectively, the right averages to be unreasonable, and the left to be reasonable. I find the media reflect that quite well. Maybe CNN forgot to consider an option, so they reconsider. Fox news doesn't, they're not trying to be reasonable.
So what's happening currently is all reasonable people on the left is trying to give a chance to the minority of reasonable people on the right. While the bigger chunk of unreasonable people on the right are trying to avoid all reasoning about alternative options.
In that sense, its normal for most reasonable news source to appear tied to the left. And most unreasonable news source to appear tied to the right.