Hillary Clinton won the Mississippi primary easily but was upset by Bernie Sanders 50-48 in Michigan despite polling that universally showed her ahead by a wide margin. 

With her Southern states almost done, fivethirtyeight.com writes, questions now arise about large Midwestern states such as Ohio, Illinois and Wisconsin. Her delegate lead remains strong (rules split delegates from Michigan), but …..

On the other side, it was another big night for Donald Trump and the implosion of the Marco Rubio campaign seems complete. How could a brokered convention — should one occur — turn to someone so universally unpopular?

March 15 looms very large — Florida, Ohio, Missouri, North Carolina, and Illinois.