Nonsense.
Fox is biased for Rubio to the point of absurdity. After Trump won Nevada by ten points, I swear I actually heard one of the commentators exclaim “tonight is a big win for Marco Rubio!”. Virtually every single real-world poll and on-line poll has Trump ahead by far - but, surprise! Fox’s focus group regularly favors... Rubio! After the last Fox debate, Rubio’s given a chance to talk about his dear, sweet family and... look at that! The cameras were all ready to show Rubio’s dear, sweet family there in the audience. Awww. Look at how cute those little Rubios are! Can’t you just SEE them in the White House? Awwwwww. After the debate, guess what the camera’s still showing as the commentators chat? You got it. Rubio and his family.
This isn’t “perception” on my part because I’m a Trump supporter. It’s clear bias in favor of pushing a favored candidate. It’s propaganda.
Was Trump then the darling of Fox? Did Fox switch its fickle allegiance to Rubio? When does my boy Cruz get a turn?
Much of this is in the eye of the beholder