The corporate oligarchy is real. Jill Stein is right to assert that the Democratic Party is counter-revolutionary. We actually have a track record to look at when it comes to efforts to change the Democratic Party into a progressive movement. The same tactics used to discredit Bernie Sanders were used against previous progressives like Jesse Jackson in 1988. So, we can safely transport your argument to 1988, and I can ask you what progress has been made in the last 28 years in the effort to make the Democrats progressive. In fact, in the interim, Bill Clinton successfully steered Democrats towards corporate-friendly positions, i.e. welfare reform that harmed single mothers, a harsh crime bill that exploded the prison population, the fateful deregulation of Wall Street that facilitated the recent economic collapse, deregulation of the Media that allowed Fox News to come into existence, etc. Hillary Clinton is the personification of corporate interests. Is that what you meant by capable?