"Pundits on TV" have very obviously been for Clinton's campaign from the beginning. Sorry, but it's the plain truth. No, it's not a conspiracy. Sanders' campaign has been antagonistic towards the press throughout the election, and the press tends to reciprocate. Furthermore, they've been calling Hillary inevitable since the campaign began. It has been so freaking obvious all along that it's almost hilarious to hear from someone that hasn't noticed.
Seriously, the main press outlets have been "for" Clinton in as obvious of a manner as they've been "against" Trump. Those are the two who get the most exposure of any of the candidates in the press, period. No, it probably isn't a conspiracy. They probably figured that those were their most profitable candidates to cover individually, without collusion, well before the campaigns really started.....