he didn't get fired. he got promoted.
until he formally drops out, sanders is still a threat. or, it may be considered more tactical to wait until after the convention.
but, the way this election is going to work is that the media is going to rip clinton apart over the emails and present trump as the sane, establishment option - presuming he stops running his mouth off. and, i think they can figure that out. if they can get bush elected, they can get trump elected.
the media coverage at this time in 2000 was not dissimilar to what it is today. it's early. the machinations are still at work.
http://www.foxnews.com/politics/2016/06/27/cnn-taps-corey-lewandowski-but-is-analyst-or-trump-spokesman.html
see, the way i read this is "cnn looking for excuse to get rid of left-leaning staff".
you can do this a few ways.
1) send an agent provocateur out to start a movement for mass resignation. that way, you don't have to fire anybody. good optics. extra bonus: no severance.
2) start a fight, then come down on the side of lewandowski to make the point.
it's not just cnn. msnbc is doing this, too.
sanders has had no effect. but, trump's popularity amongst key english speaking tv demographics is sparking a shake-up in the way the networks are going to be approaching the coverage.
http://gawker.com/are-cnn-staffers-actually-staging-a-revolt-over-corey-1782673854