What do the Democratic candidates for president believe about Medicare for All? With the exception of Bernie Sanders, it’s hard to say. Kamala Harris has backpedaled. Cory Booker contradicts himself. Elizabeth Warren has a wavering record and avoids the subject as much as possible. Meanwhile they all support competing legislation on the side.

Beto O’Rourke’s reversal is the most flagrant yet. In a mere two years the former Texas congressman has gone from vocally championing Medicare for All to bizarrely calling the single-payer policy “too ideological.” O’Rourke’s stance on health care policy has been so unclear that a Vox reporter felt the need to conduct an investigation into it.

After a career of noodling around on the issue, he seems to be zeroing in on his favored approach now that he’s running for president. O’Rourke is touting a proposal called Medicare for America, a public option bill modeled off of previous work by neoliberal think tank Center for American Progress.