McKay Coppins, staff writer for The Atlantic, talks with Alex Wagner about the peculiar psychology that causes some Republicans to offer their support for Donald Trump despite being open about Trump's overwhelming shortcomings and despite knowing full well that Trump's fickle sense of loyalty means he is still just as likely to stab them in the back, endorsement or not.  » Subscribe to MSNBC: youtube.com/msnbc Download our new MSNBC app for the latest breaking news and daily headlines at a glance: msnbc.com/information/download-msnbc-app-n1241692 Follow MSNBC Show Blogs MaddowBlog: msnbc.com/maddowblog ReidOut Blog: msnbc.com/reidoutblog MSNBC delivers breaking news, in-depth analysis of politics headlines, as well as commentary and informed perspectives. Find video clips and segments from The Rachel Maddow Show, Morning Joe, The Beat with Ari Melber, Deadline: White House, The ReidOut, All In, Last Word, 11th Hour, and Alex Wagner ...