"Without mentioning Trump by name, Obama lashed out at a 'crude populism' while defending his vision of a United States that engages, rather than withdraws, from the world stage. 'Today, a nation ringed by walls would only imprison itself'...."
I would have expected more exalted dignity and grandeur. If a big part of the problem with Trump is a perceived crudeness in his style, how do you fight that by stepping down to a cruder level yourself?
By the way, I think I'm noticing Hillary trying to talk more like Trump — or what she imagines Trump to be doing that has been working on the people it works on. I don't think that's something you should attempt on the fly.