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agsr

Speaking alongside his co-host and fiance, Mika Brzezinski, who drew the ire of the president in a series of personal social media attacks, Scarborough questioned why more Republicans didn't stand up to Trump's comments and policies, casting them as standing in opposition to his party's values — or rather, his former party.
http://www.politico.com/story/2017/07/12/scarborough-colbert-quits-republicans-240435


I will argue that Joe was pressured by Mika to make this switch now that they are engaged.  I don't think she left him much choice other than a space in the dog house

ChangeMyView

I agree with @joecavalry.  Sure, Mika put pressure on him, but it wasn't as strong as his network for keeping his good career prospects.  

joecavalry

No, I believe that the show requested for him to make the switch. Networks like these want an all democratic or most democratic cast, especially when it comes to hosts.

CuriousGeorge

@joecavalry, I agree with you that it was an additional factor.  It was likely a combination of Mika, network pressure, and  maybe personal believes.  

agsr

@CuriousGeorge and @joecavalry, great points. I still think though that Mika was a key reason in his decision. Can you just imagine how that pillow talk would go - "you let him insult me like that?".  I never underestimate role of women in many important life-changing decisions like that.