Bernie Sanders appears to have tied for most delegates in the Iowa primary, greatly boosting his chances of becoming the Democratic nominee for president. Medicare for all has been one of his signature issues. Other candidates (including Elizabeth Warren) have also endorsed a version of Medicare for all. Even if Sanders or Warren was elected, however, such a law would face numerous challeges to being passed, primarily in the US Senate where 60 senators would presumably be necessary to overcome a filibuster.