At this point not very much. However going forward he has a duty to denounce political violence done by people who support him. Don't expect courage or sanity or intelligent thought from Bernie Sanders. He lacks courage and the candor to explain political violence are wrong.
I want to point out the hypocrisy of the media. If the roles were reversed and TEA Party members chanted Commie Commie at Sanders rallies you would have outrage. Of course the elite media are all trained by the same socialist professors at elite universities.
The protesters have let us know who they are wearing keffiyehs and waving Mexican flags. These are people who hate America. Let Bill Ayers lead a crew into an actual Trump assembly. The Veterans present might not leave enough to burry.
It is too late for Cruz. Rubio stayed in way too long and handed the nomination to a clown. However, Trump is more qualified to be President than Obama. When Obama makes multiple ignorant remarks the media shrugs while pretending outrage after every Trump remark.
A vote for Hilliary is a Vote for Obama, the Blumenthal jerks and terrorists everywhere. You want to bet Donald Trump
doesn't call a gunman yelling Allah Ahkbar workplace violence or call a blood curdling attack on a Kosher supermarket random violence. The gaffes of Obama are way beyond ordinary media cheerleading. We are still waiting for Obamas grades.
A vote for Hillary is a vote for Obama.