Joe & Rev Al Sharpton's newfound friendship is interesting. He is on the show almost every day.
Joe's resolution in Congress was a very detailed list of Sharpton's comments about Jews. Joe has never publicly apologized to Rev Al for introducing his resolution to Congress.
IIRC, Rev Al Sharpton was able to get a show on MSNBC soon after supporting publicly supporting NBC's merger with Comcast.
I do think Joe respects Rev Al's influence at the network & he was helpful in bailing out Mika & Joe when they made racially insensitive remarks over the riots in Baltimore & Ferguson, Missouri.