@MilSpec what are you referring to is nothing new, novel or even surprising
Media for as long as i remember - which is post 60s has always had a liberal/left bias in almost all countries where it is relatively free like US, UK, Europe and to an extent India outside of DD
Just look at coverage of trump vs hillary, Kennedy vs Nixon, modi vs rahul gandhi - you can go as far back as you wish or just read todays newspaper to have a look at the bias. Ofcourse in opposition to mainstream bias certain counter bias will occur like in Fox news, Times Now, The sun
Now that we are done with bias confirmation, lets look at the reason for this bias -
Left/Liberal ideal stands for appeasement of weak at expense of strong - not necessarily majority vs minority politics as it is today. Such causes are often eyeball grabbing just like Poverty **** is. The other thing is that those who are strong are often content with status quo where as weak would like to change it thus giving them a cause. Cause is always exciting - unlike the humdum of right wing politics.