Post a list of all the ones that have left wing slants and I suspect your list would be quite a bit longer.
Other than the few you have posted here, pretty much all of the media is actively trying to get Democrats elected. That should be indisputable at this point.
the majority of the nation are liberal/socialists lazy bastards. Dems have won 4 of 6 past elections by a very healthy margin. Repubs have won 2 of 6 elections, by a very lucky FLorida 2000 and Ohio anomalies in 2004. Dems could have won 6 out of 6 if not for high-jinx.
Look around you - liberals everywhere - at least 51% of the nation.
Even the majority of "conservatives" have left-leaning positions these days. Conservatives -real ones - are a minority these days. So it makes sense there will be more liberal news stations to serve them. The media are just companies that serve a market like everyone else. More people like junk food too - which is why there are 3 Whole Foods in every town, and 75 fast food joints.