This time I'll just leave it to the New York Times, which makes the right points.  Note Sanders's strong support over Clinton among "independent" voters, who were allowed to participate in the Michigan primary.  Rubio is toast, and stale toast at that!  I guess it will come down to Trump v. Cruz, though hopefully Kasich will take Ohio away from Trump.

UPDATE:  One nice thing about the Rubio disaster is it shows the limits of big money on the campaign:  despite being preferred by many billionaires, Rubio is slowly going the way of Jeb Bush.

ANOTHER:  The polling disaster in Michigan regarding the Democratic race.  Polls have also been over-stating Trump's electoral support, but not by the order of magnitude by which they under-estimated Sanders's support in Michigan.