Actually, Elizabeth Warren and even Hillary herself (whose announcement commercial eons ago talked about a system "where the deck is stacked against middle class families") have been using this language long before Sanders entered the race/became famous, because... it's an accurate depiction of the current American political system, as common sense and academic research will tell you.
But of course, as we all know, you interpret everything through your lens of delusional animus toward Sanders, where everything is his fault and everything he says is insane.
In episode XLVIII, Trump uses Bernie's language of "rigged system" to talk about trade in New Hampshire. It seems like every day there's another instance of the GOP and Trump explicitly trying to make up their gap with Clinton but targeting disaffected Sanders voters and basically using the same conspiracy theories and complaints that Bernie drilled into the heads of his supporters. He needs to hurry up and endorse before it's too late.
Actually, as was discussed in a thread earlier this week, Sanders' supporters are consolidating behind Hillary faster than the PUMAs did in '08. So Bernie does not really need to hurry up. He already said that he plans to vote for Hillary, stopped attacking her, and encouraged his supporters to stop Trump. Hillary likely won't lose because America isn't stupid and she's too smart, but if she does, it'll be her own fault for running a tone-deaf campaign.
