Definitely was already there. I'd guess that people hate insurance companies more than they hate politicians - in fact, I'd go so far as to say that at least some of the hate for politicians is sublimated hate for insurance companies and our Kafkaesque healthcare system. It's almost a bit surprising that this is the first time this has happened. And now that someone has done it, it seems likely that there will be copycat attempts.
Was it? If that's the case, why do the majority of M4A voters say their support is conditioned on them retaining access their existing private insurance?
You get frustrated when your doctor is 30 minutes late. Being denied coverage by your insurance for something serious and expensive is a matter that causes hate.