We saw in San Jose these protesters starting to pelt stuff [at] Trump supporters. That's not what our democracy is about. That's not what you do. There's no room for violence. There's no place for shouting. There's no room for a politics that fails to at least listen to the other side — even if you vehemently disagree.

At a DNC fundraiser in Florida, as quoted in "Obama condemns violence at Trump rally" by Evelyn Rupert, The Hill (3 June 2016)