Like any good presidential candidate, Elizabeth Warren knows where she’s weak.

Her Democratic opponents were the first ones to point out that her plan-for-everything agenda lacks an adequate, comprehensive healthcare alternative, and Warren has spent the past few months trying to fix this. She’s still arguing that a mandatory Medicare-for-All program won’t affect middle-class taxpayers, but she is now offering them an alternative: a buy-in option that resembles Joe Biden’s and Pete Buttigieg’s.