Well, alright, poor guy. I do sympathise. But being poisoned does not make him any better or worse a candidate for the presidency, it only makes the other guy a total prick. Specifically, I he think he would make a better Prez, though not the white knight that the media makes him out to be.
Remember, he too in an oligarch (some would argue ex-oligarch), and his support (I don't mean the populist take to the streets kind of support, I mean the kind that matters - financial support) comes from energy giants and neo-libs who pillaged state assets after the fall of communism.