They have no principles, other than hating the Right-Wing/Religous/Trump-Supporting side. Whatever their idealogical enemies support, they are against. Its an automatic reflex after they've been to hate their opposition.
Most left-wing/liberals/leftists aren't independent thinkers. The giant corporations, big pharma, wallstreet, and bankers either own or bought off all the leftist mouthpieces and now they lead them.
Everything the liberal/leftists used to be against...
*Military Industrial Complex
*Big Pharma
*Oil/Energy companies
*Mass Media
*Healthcare/Insurance corporations
*Big Tech Corporations
...they are now their blindest cheerleaders.
By design.