Here's a nice take by Charles Pierce on the President's speech last night. Basically, he points out that his carefully reasoned points were wasted on vast swaths of the country that seem to think Donald Trump or Ben Carson (or Rubio, Cruz, Bush, etc.) are perfectly respectable candidates for the highest office in the land.
As he noted:
He seemed to be talking to a country that would never fall for the snake-oil being peddled across the landscape by Donald Trump, to a country where the architects of the current disaster would be in jail, and not unveiling statues of themselves in the nation's Capitol, and to a country that knows something about history and the way the world actually operates. I would like to live in that country some day. (emphasis added)
What more can you say?