What is Trump supporting on trade? And if Cruz wins how quickly do millions of federal workers get put out of work? I sure an american depression from all the out of work federal employees wouldn't help the world poor either.
What I really don't like about Sanders is that his main issue is inequality, but global inequality is so much worse and so much more serious than just American inequality. He would strip billions of unskilled workers' ability to have clean water, feed themselves, and send their kids to school, so that American unskilled workers can have large house with a two car garage, 4 weeks vacation every year, and retire at 60.
The big problem with any trade deal that protects the american worker results in higher costs and some kind of trade war.