In the wake of the Republican failure to repeal the Affordable Care Act on Friday, leading figures in the progressive wing of the Democratic Party are rallying behind a single-payer health insurance and a raft of other bold reforms. These lawmakers and grassroots leaders have long believed that the problems plaguing the Affordable Care Act, also known as Obamacare, are rooted in the original health care laws attempt to accommodate, rather than gradually replace, the private, for-profit health insurance system.