I never said MSNBC wasn't partisan.
But Fox News literally coordinates with the Trump team and he lavishes them personally with praise via Twitter almost every week. It's far more akin to campaign outreach rather than independent news. This never happened with Obama or the DNC.
MSNBC also does have independent journalists e.g. Chuck Todd and right-wing commentators e.g. Hugh Hewitt, Joe Scarborough etc. So it's not entirely liberal.