What Would It Take for Bernie Sanders to Win?

After another strong showing by former Vice President Joseph R. Biden Jr. in Tuesday’s primary contests, Senator Bernie Sanders of Vermont announced that he was staying in the race for president.

But Mr. Sanders will need to do substantially better in the contests that remain to secure enough delegates to win the Democratic presidential nomination. Here are some possible outcomes for the primaries, and what the candidates will have to do to reach them. CONT.

Lauren Leatherby, Rich Harris, Nate Cohn & Josh Katz, New York Times