I am very suspicious of your contention that Fox is leftist. You may be simply blind to reality (i.e., Mort is a commentator who is balanced by more conservative and more liberal commentators) or you may be simply trying to stir up conservatives about Fox. I suspect the latter. Perhaps you can enlighten us as to your motives.
Considering how the MSM filters and distorts information to suit their leftist agendas, it's obvious that Fox (especially the news show anchored by Brit Hume) tries to be fair and balanced. It does not always succeed, but it seems remarkably misguided to call it leftist.
Fox News is run by a big-government globalist (Rupert Murdoch) who barely meets even the most basic definition of a "conservative." People like this tend to be non-political in their outlook, which explains why Fox is considered a "conservative" cable news network even as Murdoch is hosting cocktail parties for Hillary Clinton.