Maddow: To block Trump's agenda, help Republican politicians find their spines

Rachel Maddow emphasizes the importance of resistance by Republican legislators to Donald Trump's agenda, and points out that the unpopularity of Trump's actions may help that resistance politically, but also some senators, like Senator Bill Cassidy of Louisiana, have enough expertise in their chosen field to know how destructive Trump and his Cabinet are, and may be vulnerable to pressure on those issues.