And Joe himself is a former Republican congressman
If you search "Morning Joe" you get the following page snippet as the first result: "More about the MSNBC Morning Joe show. Watch Morning Joe for news commentary & informed perspectives. Hear the news from Morning Joe guests today". This is on a website titled "MSNBC News".
First sentence of the Wikipedia article for the show: "Morning Joe is an American morning news talk show".
Google presents this description in the sidebar, not sure where it's from: "The show attracts a wide variety of guests, including top newsmakers, Washington insiders, journalists, and cultural influencers, representing a diverse set of voices and opinions that provide keen insight and analysis around the day's biggest stories".
Part of the reason news outlets like the WP, the NYT, CNN and MSNBC attract such opprobrium is because they all advertise themselves as unbiased and neutral arbiters of the truth without any political leanings, yet they're all extremely biased in ways that their own staff will happily admit to and even go to the wall to fight for. When Joe Scarborough went on TV and said "this Biden is the best Biden ever", he knew he was lying, and he knew he was lying about presenting a diverse set of voices and opinions too.